How to save the sum of fields in an interface and write them to a different record

Hi! I´m making an interface in which the user can add new rows. After filling the price and the quantity, the column "Importe Total" is calculated

I would want to save and show the value of the sum of the values in the column "Importe Total", to make a "Total Sum", show this in another cell and save the value into another record (the data of the PO lines are saved in a different record, specific for PO Lines, and the value of the total sum would be saved in a Record of "global" PO)

*In the case of the pic, the TotalSum = 200

I leave here pics of the configuration and the code inserted (applied the magic button to order it and make it more readable)

1-Logic of the pxq (Total Importe Column) --> the logic was applied in the "cantidad" and "precio unitario" columns in order to save the value "Importe Total" correctly

2- The entire code:

a!localVariables(
  local!grid,
  {
    a!sectionLayout(
      label: "Líneas Pedido",
      labelIcon: "list-alt-solid",
      contents: {
        a!gridLayout(
          label: "A continuación, incorpore las líneas de factura correspondientes y pulse el botón de creación",
          headerCells: {
            a!gridLayoutHeaderCell(label: "Linea Pedido"),
            a!gridLayoutHeaderCell(label: "Pedido"),
            a!gridLayoutHeaderCell(label: "Proveedor"),
            a!gridLayoutHeaderCell(label: "Material"),
            a!gridLayoutHeaderCell(label: "Precio Unitario"),
            a!gridLayoutHeaderCell(label: "Cantidad"),
            a!gridLayoutHeaderCell(label: "Importe Total"),
            a!gridLayoutHeaderCell()
          },
          columnConfigs: {
            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "DISTRIBUTE"),
            a!gridLayoutColumnConfig(width: "ICON")
          },
          rows: a!forEach(
            items: local!grid,
            expression: a!gridRowLayout(
              contents: {
                a!textField(value: {fv!index}, saveInto: {'recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{fcfa4b36-4398-4430-8055-ecfa59daf13a}idLineaPedido'}),
                a!textField(
                  value: fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{71427dbb-12db-4f83-bd99-f625bf9af271}idPedido'],
                  saveInto: {
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{71427dbb-12db-4f83-bd99-f625bf9af271}idPedido']
                  }
                ),
                a!textField(
                  value: fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{464f0883-d6d5-4c58-b054-4de8e9e99902}Proveedor'],
                  saveInto: {
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{464f0883-d6d5-4c58-b054-4de8e9e99902}Proveedor']
                  }
                ),
                a!textField(
                  value: fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{69e9a834-b2fb-4f35-a36d-3c526c97f4ac}Material'],
                  saveInto: {
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{69e9a834-b2fb-4f35-a36d-3c526c97f4ac}Material']
                  }
                ),
                a!floatingPointField(
                  value: fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit'],
                  saveInto: {
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit'],
                    a!save(
                      fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{beb59a89-a332-46d3-b718-a8285f58f942}Importe'],
                      if(
                        or(
                          isnull(
                            fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad']
                          ),
                          isnull(
                            fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit']
                          )
                        ),
                        0,
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad'] * fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit']
                      )
                    )
                  },
                  required: true,
                  validations: {
                    if(
                      a!isNotNullOrEmpty(
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit']
                      ) = false,
                      "",
                      if(
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit'] < 0,
                        "El precio unitario debe ser superior a cero",
                        ""
                      )
                    )
                  }
                ),
                a!integerField(
                  value: fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad'],
                  saveInto: {
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad'],
                    a!save(
                      fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{beb59a89-a332-46d3-b718-a8285f58f942}Importe'],
                      if(
                        or(
                          isnull(
                            fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad']
                          ),
                          isnull(
                            fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit']
                          )
                        ),
                        0,
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad'] * fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit']
                      )
                    )
                  },
                  required: true,
                  validations: {
                    if(
                      a!isNotNullOrEmpty(
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad']
                      ) = false,
                      "",
                      if(
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad'] < 1,
                        "La cantidad debe ser superior a cero",
                        ""
                      )
                    )
                  }
                ),
                a!floatingPointField(
                  value: if(
                    or(
                      isnull(
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad']
                      ),
                      isnull(
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit']
                      )
                    ),
                    0,
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{e78c5b35-026f-4713-8404-05077c6c9152}Cantidad'] * fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{47f4bf32-2e41-4c5a-a7e7-9fc7786bd753}PrecioUnit']
                  ),
                  saveInto: {
                    fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{beb59a89-a332-46d3-b718-a8285f58f942}Importe']
                  },
                  required: true,
                  validations: {
                    if(
                      a!isNotNullOrEmpty(
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{beb59a89-a332-46d3-b718-a8285f58f942}Importe']
                      ) = false,
                      "",
                      if(
                        fv!item['recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{beb59a89-a332-46d3-b718-a8285f58f942}Importe'] < 0,
                        "El importe debe ser superior a cero",
                        ""
                      )
                    )
                  },
                  align: "RIGHT"
                ),
                a!richTextDisplayField(
                  value: {
                    a!richTextIcon(
                      icon: "times-circle",
                      link: a!dynamicLink(
                        value: remove(local!grid, fv!index),
                        saveInto: local!grid
                      ),
                      linkstyle: "STANDALONE",
                      color: "NEGATIVE"
                    )
                  }
                )
              }
            )
          ),
          addrowlink: a!dynamicLink(
            label: "Añadir nueva Línea de Pedido",
            saveInto: a!save(
              target: local!grid,
              value: append(
                local!grid,
                'recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido'(
                  'recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{71427dbb-12db-4f83-bd99-f625bf9af271}idPedido': ri!record['recordType!{3c95c0e4-e69d-43f6-b485-e72b24252af7}CPF Maestro Pedidos.fields.{7309402c-2312-4a4e-bdaa-5654789bffb2}idPedido'],
                  'recordType!{495578a9-1b23-4253-8145-6418faabe727}CPF Lineas Pedido.fields.{464f0883-d6d5-4c58-b054-4de8e9e99902}Proveedor': ri!record['recordType!{3c95c0e4-e69d-43f6-b485-e72b24252af7}CPF Maestro Pedidos.fields.{e11e6206-fc23-4a4b-9819-4db5a5bab685}nomProveedor']
                )
              )
            )
          )
        )
      }
    ),
    a!buttonLayout(
      primaryButtons: {
        a!buttonWidget(
          label: "Completar Creación Pedido",
          saveInto: a!writeRecords(
            records: local!grid,
            onSuccess: { a!save(local!grid, fv!recordsUpdated) }
          ),
          submit: true,
          style: "PRIMARY",
          validate: true
        )
      },
      secondaryButtons: {
        a!buttonWidget(
          label: "Cancelar",
          value: true,
          saveInto: ri!cancel2,
          submit: true,
          style: "NORMAL",
          validate: false
        )
      }
    )
  }
)

Thanks a lot for your help!

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