How to Merge Assets and then Split COMBINED asset cost into multiple FA units

Hello,

Problem statement:  From Prepare Mass Additions form, I want to be able to first MERGE 3 invoice lines (asset cost, tax and freight) and then SPLIT the asset. I want to do both in the same asset Period and BEFORE posting the asset.

Scenario: Working in 11.5.10 with Oracle iProcurement, PO, AP, and FA. 

AP interfaces to FA separate invoice lines, one each for 1) Asset cost, 2) tax, and 3) freight.  This is the downstream affect from iProcurement to PO to AP Invoice matching.  Now FA Processor needs to merge the 3 separate invoice lines (assume all have the same invoice and PO number). Total units invoiced are 20 units.  Now FA Processor needs to split the MERGED lines into 20 individual units.