does ascp drive BOM components through a buy item?

Situation at hand:  Using Demantra to generate a demand for a purchased item into an ASCP plan.  The purchased item has a BOM created that lists 6 separate components that are "options" to the purchased item, and the options are given a "usage percentage" via the Yield attribute in the BOM that will list a value > 1 as an inverse of the usage (i.e. 50% usage item would show a yield value of 2). 

Traditionally (in most systems), an item flagged as a "Buy" will not blow through the BOM to the lower level requirements.  If that logic is the same, I will need to derive a method to drive these requirements into ASCP for the optional items to create planned orders to execute as purchases.