Presently, the accessory item can be non-billable; do not order and included.
For handling cases like a pair of speakers, we need another checkbox that says "Placeholder," which will be a speaker shape with the selected product model and manufacturer details, etc., that can be dropped into the drawings but will never show in level 2 proposals or any line item reports. Might be required in install checklist reports.
This sounds like a good idea, or would just marking as non-billable and not ordering do the trick, and this might not be needed?