Remove the selected record from the Custom Picker List

Your code in a more readable way:

a!localVariables(
  local!selIndex,
  local!selItem,
  local!selectedRecord: rule!ACRA_GetExistingInfo(),
  local!currentRecords: a!refreshVariable(
    value: if(
      a!isNullOrEmpty(ri!selectedProducts),
      null(),
      ri!selectedProducts
    ),
    refreshOnReferencedVarChange: true
  ),
  local!recordLabels: a!refreshVariable(
    value: if(
      a!isNullOrEmpty(local!currentRecords),
      local!selectedRecord.proposedName,
      remove(
        local!selectedRecord,
        tointeger(
          wherecontains(
            touniformstring(local!currentRecords.proposedName),
            touniformstring(local!selectedRecord.proposedName)
          )
        )
      ).proposedName
    ),
    refreshOnReferencedVarChange: true
  ),
  /*local!recordLabels:local!selectedRecord.proposedName,*/
  local!newRow: 'type!{urn:com:appian:types:ACRA}ACRA_ProposedNamesInfo'(),
  local!products: 'type!{urn:com:appian:types:ACRA}ACRA_ProposedNamesInfo'(),
  a!gridLayout(
    label: "Editable Grid",
    labelPosition: "ABOVE",
    headerCells: {
      a!gridLayoutHeaderCell(label: "Id"),
      a!gridLayoutHeaderCell(label: "Picker"),
      a!gridLayoutHeaderCell(label: "Selected Name"),

    },
    columnConfigs: {
      a!gridLayoutColumnConfig(width: "DISTRIBUTE", weight: 5),
      a!gridLayoutColumnConfig(width: "DISTRIBUTE", weight: 5),
      a!gridLayoutColumnConfig(width: "DISTRIBUTE", weight: 5),

    },
    rows: {
      a!forEach(
        items: ri!selectedProducts,
        expression: a!gridRowLayout(
          contents: {
            a!textField(
              value: if(
                a!isNullOrEmpty(fv!item.proposedName),
                {},
                fv!item.pId
              ),
              saveInto: fv!item.pId
            ),
            a!pickerFieldCustom(
              label: "Names",
              instructions: "Enter the name.",
              maxSelections: 1,
              suggestFunction: rule!ucArrayPickerFilter(
                filter: _,
                labels: local!recordLabels,
                identifiers: local!recordLabels
              ),
              selectedLabels: a!forEach(
                items: fv!item.proposedName,
                expression: index(
                  local!recordLabels,
                  wherecontains(
                    touniformstring(fv!item),
                    touniformstring(local!recordLabels)
                  )
                )
              ),
              value: fv!item.proposedName,
              saveInto: {
                a!save(fv!item.proposedName, save!value),
                a!save(
                  local!products,
                  rule!ACRA_GetProductsByName(pname: fv!item.proposedName)
                ),
                a!save(fv!item.pId, local!products.pId),
                a!save(fv!item.status, local!products.status),
                a!save(local!selItem, fv!item),
                /*a!save(local!selIndex,*/
                /*tointeger(wherecontains(*/
                /*touniformstring(fv!item.proposedName), */
                /*touniformstring(local!recordLabels)*/
                /*))*/
                /*),*/
                /*a!save(local!recordLabels,remove(local!recordLabels,*/
                /*tointeger(wherecontains(*/
                /*touniformstring(fv!item.proposedName), */
                /*touniformstring(local!recordLabels)*/
                /*)))),*/

              }
            ),
            a!textField(
              value: if(
                a!isNullOrEmpty(fv!item.proposedName),
                {},
                fv!item.status
              ),
              saveInto: fv!item.status
            ),

          }
        )
      )
    },
    addRowLink: a!dynamicLink(
      label: "Add Row",
      saveInto: a!save(
        ri!selectedProducts,
        append(ri!selectedProducts, local!newRow)
      )
    ),

  )
)

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