Volume attribute for use in Spacedesign

[Azaezil]

I've been working with Rp Spacedesign and i'm trying to find a way to assign a volume attribute to a component. I'm using spacedesign to generate bill of materials and need volume for concrete and fill. Also would like to be able to create an attribute to measure area of a specific material. The materialarea command in sketchup dc is for ungrouped objects. Any suggestion are greatly appreciated