Post invoice in FICA with separate sub transaction other than 0002.

Hi,

In my current configuration of invoicing, my invoice is posted in FI-CA with main/sub 0100/0002. Instead of that, I want to post invoice with separate items, like if invoice is having 3 different line item types it should be posted with three different sub transactions with main 0100. How can it be achieved?

Thanks

Viraj