Creating Blocks on the Fly

[mcguirepm]

I have a VBA program that creates 3D blocks on the fly. The blocks are attributed, but now I want to add data to the blocks so that we can start using the BOM feature in AcadMech 2008.

 

The kicker here is I need to figure whether to use Mechanical Structures or Part References.

 

Which one can be seen by the BOM through Xrefs?

 

Lastly, can someone tell me how to make this proper type of data part of a block.

 

Thanks in advance.