This is a great question, and one we been thinking through related to material quantity reporting for state procurement policies. Have you checked out the Projects component of the EC3 tool? That part of the tool is set up to address that question, as it is a place for entering and tracking material quantities with data like:
- Assembly/Subassembly by Uniformat or Masterformat category
- Component name
- Quantity and Unit (e.g. 1 yd3 of concrete or 1 lb of steel rebar)
- EPD
You could also check out Appendix B of the Buy Clean Washington Study to see an older example of a structural material quantity reporting template.