Demantra - EBS standard Integration question

 We are having a decentralized env with ASCP and Demantra on 10g database and 11.5.10.2 APS with 7.2.0.2 Demantra install (MSDEM schema). Because of time constraint we want to use standard integration to pull data from EBS.

Assume the item hierarchy look like this:
SKU > Model > Product Type > Product Category > Product Family
Lowest Level Item >>>>>>>>>>>>>>>>>>>> Highest Level Item

Our approach is to use place holder on Oracle EBS to maintain the data and mapping at t_src_tables to correct item hierarchy in demantra.
We are ok with Product category and product family, can anyone advice how we can use place holder for product type and model level.