Weldment BOM

I have a single part which contains a weldment frame structure (Multiple frame pieces).  When I bring it into a drawing, and try to create a BOM, it creates a single line item treating the part as one part.

To create a BOM of this weldment structure, do all individual frame pieces need to be individual parts or can I keep the whole frame structure in one part on the drawing and have a BOM identify each individual pieces?

Thanks

SolidworksDrawings And Detailing