When manipulating CAD data that should be useful to see both prt/asm and drw.
Today you can see either :
prt and asm as a tree
prt, asm and drw but in a flat view.
Being able to see all the 3 types of objects as a tree is a quick way to check if something is not missing.
This feature is available in the BOM view, where you can see WTPart + PRT + ASM + DRW in a tee view.