editable grid

Your code is almost impossible to read. Could you remove the commented blocks and use this

okay

okay

a!localVariables(
  local!crCustFolder_cdt: rule!CR_CUST_QE_getfolderIdDetailsBasedOnCif(
    cif_int: ri!cif_int
  ),
  local!getFolderId_int: index(
    local!crCustFolder_cdt,
    "folderId_int",
    tointeger(null)
  ),
  a!gridLayout(

    label: {ri!sectionName_txt & if(ri!sectionName_txt = cons!CR_CUST_SECTION_NAME[1], cons!CR_CUST_GRID_LABEL[1], cons!CR_CUST_GRID_LABEL[2])},
    headerCells: {
      a!gridLayoutHeaderCell(
        label:cons!CR_APP_DOCUMENTS[1]
      ),
      a!gridLayoutHeaderCell(
        label:cons!CR_APP_DOCUMENTS[2]
      ),
      a!gridLayoutHeaderCell(
        label:cons!CR_APP_DOCUMENTS[3]
      ),
      a!gridLayoutHeaderCell(
        label:cons!CR_APP_DOCUMENTS[4]
      ),
      
      a!gridLayoutHeaderCell(
        label:""
      )
    },
    columnConfigs: {
      a!gridLayoutColumnConfig(
        width: "DISTRIBUTE",
        weight: "1"
      ),
      a!gridLayoutColumnConfig(
        width: "DISTRIBUTE",
        weight: "1"
      ),
      a!gridLayoutColumnConfig(
        width: "DISTRIBUTE",
        weight: "1"
      ),
      
      a!gridLayoutColumnConfig(
        width: "DISTRIBUTE",
        weight: "1"
      ),
      
      a!gridLayoutColumnConfig(
        width: "ICON"
      )
    },

    rows: a!forEach(
      items: ri!crCustDoc_cdt,
      expression: a!gridRowLayout(
        id:fv!item.id_int,
        contents: {
          a!textField(
            label:"",
           
            /*value: a!linkField(*/
              /*label: if(isnull(fv!item.docId_int),"",*/
              /*document(fv!item.docId_int, "name")),*/
              /*links: a!documentDownloadLink(*/
                /*label: if(isnull(fv!item.docId_int),"",*/
                /*document(fv!item.docId_int, "name")),*/
                /*document: fv!item.docId_int*/
              /*)*/
            /*)*/
          ),
         
         
          a!textField(
            value: rule!APN_FN_getDisplayName(
              userId: index(
                fv!item,
                "addedBy_txt",
                {}
              )
            ),
            readOnly: true()
           
          ),
          a!textField(
            value: rule!CR_FN_nbfDateTimeFormat(
              input: fv!item.addedOn_dt
            ),
            readOnly: true()
            
           
          ),
          
          a!fileUploadField(
            label: "File Upload",
            labelPosition: "ABOVE",
            target: tofolder(
              ri!folderId_int
            ),
            maxSelections:1,
            value: ri!uploadedDoc_int,
            
            saveInto: ri!uploadedDoc_int,
            showWhen: if(
              ri!IsReadOnly_boolean,
              false(),
              true()
            ),
           
           
            required: true(),
            validations: {
              a!localVariables(
                local!invalidExtensions: difference(
                  upper(
                    fv!files.extension
                  ),
                  {
                    cons!CR_CUST_FILE_EXTENSION
                  }
                ),
                if(
                  length(
                    local!invalidExtensions
                  ) > 0,
                  cons!CR_CUST_VALIDATION_MESSAGE[1] & index(
                    fv!files,
                    "name",
                    wherecontains(
                      local!invalidExtensions,
                      upper(
                        fv!files.extension
                      )
                    ),
                    {}
                  ),
                  ""
                )
              ),
              if(
                or(
                  fv!files.size > cons!CR_CUST_MAX_UPLOAD_FILE_SIZE
                ),
                cons!CR_CUST_VALIDATION_MESSAGE[2] & index(
                  fv!files,
                  "name",
                  where(
                    fv!files.size > cons!CR_CUST_MAX_UPLOAD_FILE_SIZE
                  ),
                  {}
                ),
                ""
              )
              
            }
          ),
          
          a!richTextDisplayField(
            label: "Remove",
            value: a!richTextIcon(
              icon: "REMOVE",
              caption: "Delete",
              link: a!dynamicLink(
                value: cons!CR_APP_TXT_AUDIT_STATUS[3]

              ),
              linkStyle: "STANDALONE",
              color: "NEGATIVE"

            )
          )

        }
      )  
    ),
    addRowLink: a!dynamicLink(
      label: "Add Documents",
      value: true(),
      saveInto: {
        a!save(
          ri!crCustDoc_cdt,
          append(
            ri!crCustDoc_cdt,
            'type!{urn:com:appian:types:NBF}CR_Cust_Doc'(
              cif_int: ri!cif_int,
              folderId_int:ri!folderId_int ,
              
              
            )
          )
        )
      }
      
    )
  )
)

Way better.

What exactly to you mean with "delete the uploaded documents ,I am getting added by and adden on values before uploading documents"?

Yeah I think it would be helpful to describe what your goal is here. Some things I did notice in the code are that your delete icon doesn't currently do anything (there's no saveInto), and your added by and added columns are always read only, so your current code doesn't provide any way of editing them.