Can I use it to sum assembly type takeoff quantities to another assembly per screenshot below?

Hi Victor. We're working on this as we speak. Hopefully a patch can go out later today for this.
Once we finish, you would use sum('Wall Area')
Much appreciated, Heber! This solves something I've been in an eternal struggle with all other QTO software I've tried. I'm very excited about this update and all that's to follow.
Keep up the good work!
Thanks for all your input and support! We have a great team here pushing hard. It's a lot of work, but also a lot of fun 😊🚀