How to add fields to already loaded cube or dso and how to fill records in

how to add fields to already loaded cube or dso and how to fill  it.can any one tell me the critical issues in data loading process..?

This is sensitive task with regards to large volumes of data in infoproviders.
The issue is to reload of data in case of adjusted structures of infoproviders.
Indeed there are some tricks. See following:
http://weblogs.sdn.sap.com/cs/blank/view/wlg/19300
https://service.sap.com/sap/support/notes/1287382

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    KP
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          EBELN TYPE EKKO-EBELN,
          BUKRS TYPE EKKO-BUKRS,
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          EBELN TYPE EKPO-EBELN,
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         CANCELED                          = 1
         DEVICE                            = 2
         FORM                              = 3
         OPTIONS                           = 4
         UNCLOSED                          = 5
         MAIL_OPTIONS                      = 6
         ARCHIVE_ERROR                     = 7
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         MORE_PARAMS_NEEDED_IN_BATCH       = 9
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         ELEMENT                        = 'HEAD'
         WINDOW                         = 'HEADER'
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         ELEMENT                        = 1
         FUNCTION                       = 2
         TYPE                           = 3
         UNOPENED                       = 4
         UNSTARTED                      = 5
         WINDOW                         = 6
         BAD_PAGEFORMAT_FOR_PRINT       = 7
         SPOOL_ERROR                    = 8
         CODEPAGE                       = 9
         OTHERS                         = 10
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    MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
             WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
      ENDIF.
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      LOOP AT IT_EKPO INTO WA_EKPO.
      concatenate wa_ekko-ebeln wa_ekpo-ebelp into v_item.
        CALL FUNCTION 'WRITE_FORM'
         EXPORTING
           ELEMENT                        = 'ITEM'
           WINDOW                         = 'MAIN'
    EXCEPTIONS
       ELEMENT                        = 1
       FUNCTION                       = 2
       TYPE                           = 3
       UNOPENED                       = 4
       UNSTARTED                      = 5
       WINDOW                         = 6
       BAD_PAGEFORMAT_FOR_PRINT       = 7
       SPOOL_ERROR                    = 8
       CODEPAGE                       = 9
       OTHERS                         = 10
        IF SY-SUBRC <> 0.
    MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
             WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
        ENDIF.
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      READ TABLE IT_LFA1 INTO WA_LFA1 INDEX 1.
      CALL FUNCTION 'WRITE_FORM'
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         ELEMENT                        = 'VENDOR'
         WINDOW                         = 'ADDRESS'
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         ELEMENT                        = 1
         FUNCTION                       = 2
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         UNOPENED                       = 4
         UNSTARTED                      = 5
         WINDOW                         = 6
         BAD_PAGEFORMAT_FOR_PRINT       = 7
         SPOOL_ERROR                    = 8
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         OTHERS                         = 10.
      IF SY-SUBRC <> 0.
    MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
             WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
      ENDIF.
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    CALL FUNCTION 'WRITE_FORM'
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        WINDOW                         = 'TOTAL'
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       ELEMENT                        = 1
       FUNCTION                       = 2
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    MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
             WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
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      CALL FUNCTION 'CLOSE_FORM'
       EXCEPTIONS
         UNOPENED                       = 1
         BAD_PAGEFORMAT_FOR_PRINT       = 2
         SEND_ERROR                     = 3
         SPOOL_ERROR                    = 4
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