I have an assembly that I'm trying to set up Costing with, that has a number of Enveloped components; They are used extensively to define the shape and arrangement of the existing parts but they aren't actually really there. Unfortunately, Costing seems to still take them into account.

With parts that we entirely exclude from the BOM, I can just set their price to zero or exclude them, but there are a couple instances of parts where only some of them (2 out of 3) are on the BOM and the third is enveloped; I can't figure out how to exclude the enveloped instances from costing, but include the non-enveloped. Is there any way to do this?