Thank you both
1) I assume your contributions here are a labor of love and not reimbursed, so I will endeavor to be more exacting in my future comms (but I don't think "take-off tool" is an egregious leap from "materials list"). Whatever. I am tracking new vs. existing to remain in the materials list. (Making a comment and keeping the existing fixture cost at $0 will be my main method of tracking what is new vs. existing)
2) But the software is advertised as a remodeling platform. Managing two sets of plans (existing and proposed), is not a best practice when a renovation project can require distinguishing between hundreds of wall, fixture and objects, some existing to remain and some new.
3) Why not add a "DEMOLITION" layer that is default dashed lines in plan, and is not picked up in the materials list?