Moving data from one ITAB to another with different structure

Hi,

I have 2 ALVs in a view where i need to add the selected data from ALV1 to ALV2 when i press ADD button and remove the selected data from ALV2 to ALV1 when i click REMOVE button.

The problem is ALV2 has an extra field.

STEP 1: I use GET_SELECTED_ELEMENTS from ALV1 and push it to an ITAB1,

STEP 2: I need to loop at ITAB1 and pass individual data to ITAB2 as ITAB2 has an extra field.

How do i achieve step 2. What will be the work area type? I cannot use work_area1 like like of ITAB1.

Please help.