I use custom columns in Bluebeam for electrical estimating and quantity takeoff workflows.
In older versions, I could select multiple markups and quickly change a custom dropdown value (such as a system classification) for all selected items at once through the Properties interface.
In newer versions, that workflow either no longer exists or is much harder to access. Editing custom dropdown columns now often requires changing items one at a time, which becomes very slow on large takeoffs.
Please consider improving support for bulk editing custom columns, especially Choice/dropdown fields, so they work more like standard markup properties when multiple markups are selected.
This would help estimating workflows significantly.