REUSE_ALV_HIERSEQ_LIST_DISPLAY and subtotal functionality

Hello,

I'm using REUSE_ALV_HIERSEQ_LIST_DISPLAY for a report.

Can a field in the ITEM_TABLE (ITEMCOST) be subtotaled directly into a field in its parent line in the HEADER_TABLE (TOTALINVOICE)?

Or do I need to do this programmatically outside of the call to REUSE_ALV_HIERSEQ_LIST_DISPLAY?

Thx.

Andy