How to adjust catia BOM level of detail for each subassembly separately , "in drafting workbench"?

Hello all,
I use catia software , when I generate a bill of material at drafting workbench ,all subassemblies illustrated as top level or sammurized denpending on BOM standard format type ,but I need to illustrate some of them as subassemblies and others as individual parts , i tried to use products & components but also this doesnot solve the problem ,
How can i solve this problem ?
Your help is very much appreciated
Thank you