I've added bolts, washers and nuts to an assembly using the toolbox.  After doing this, I made them into a sub-assembly, hoping this would add them as one line item in the BOM, instead of 3 separate lines.  This did not work. 

Our BOM has the following columns for each item we list.

No. Pieces

Description

Length

Piece Mark

Remarks

Steel Grade

I would like to list the bolt under the description, and have the Nut and FW fall under the remarks part of the BOM.

Our company is just starting to use SW, after years of using AutoCAD, and we're learning on the fly.  Any help would be appreciated.