I have fetched data in first and second internal table on some condition but I have to move the data into a final internal table so I can perform some more condition.
Go throw this Example I hope that this will helps you.

DATA : BEGIN OF IT_VBAK OCCURS 0,
         VBELN LIKE VBAK-VBELN,
         KUNNR LIKE VBAK-KUNNR,
       END OF IT_VBAK.
* Sales Order Line Item Data
DATA : BEGIN OF IT_VBAP OCCURS 0,
         VBELN LIKE VBAP-VBELN,
         MATNR LIKE VBAP-MATNR,
         ARKTX LIKE VBAP-ARKTX,
         KWMENG LIKE VBAP-KWMENG,
         MEINS LIKE VBAP-MEINS,
         NETPR LIKE VBAP-NETPR,
         waerk like vbap-waerk,
         NETWR LIKE VBAK-NETWR,
       END OF IT_VBAP.
* Final Internal Table for Display
DATA : BEGIN OF IT_FINAL OCCURS 0,
          VBELN LIKE VBAK-VBELN,
            KUNNR LIKE VBAK-KUNNR,
          MATNR LIKE VBAP-MATNR,
          ARKTX LIKE VBAP-ARKTX,
          KWMENG LIKE VBAP-KWMENG,
          MEINS LIKE VBAP-MEINS,
          NETPR LIKE VBAP-NETPR,
          WAERK like vbap-WAERK,
          NETWR LIKE VBAK-NETWR,
       END OF IT_FINAL.
 
loop at it_vbak.
  LOOP AT IT_VBAP
            WHERE VBELN EQ IT_VBAK-VBELN.
      MOVE : IT_VBAK-KUNNR   TO IT_FINAL-KUNNR,
             IT_VBAK-VBELN   TO IT_FINAL-VBELN,
             IT_VBAP-MATNR   TO IT_FINAL-MATNR,
             IT_VBAP-ARKTX   TO IT_FINAL-ARKTX,
             IT_VBAP-KWMENG  TO IT_FINAL-KWMENG,
             IT_VBAP-MEINS   tO IT_FINAL-MEINS,
             IT_VBAP-NETPR   TO IT_FINAL-NETPR,
             IT_VBAP-NETWR   TO IT_FINAL-NETWR,
             IT_VBAP-WAERK    to it_final-waerk.
      APPEND IT_FINAL.
      CLEAR IT_FINAL.
 ENDLOOP.
endloop. 



Serkan AKKAVAK
Computer Engineer
serkurumsal@yandex.com