internal tables

Hello Experts,

Can anybody please tell me how can I transfer the data in 2 internal tables to a 3rd internal table.

I'm using the 3rd internal table to output.

The 3 internal tables are like this:

1st:

data: begin of i_data occurs 0,

bstnk like vbak-bstnk,

vbeln like vbak-vbeln,

end of i_Data.

2nd:

data: begin of i_data2 occurs 0,

fkdat like vbrk-fkdat,

fkimg like vbrp-fkimg,

end of i_data2.

3rd:

data: begin of i_data3 occurs 0,

bstnk like vbak-bstnk,

vbeln like vbak-vbeln,

fkdat like vbrk-fkdat,

fkimg like vbrp-fkimg,

end of i_data3.

thnx for the help.