see captured image, all rooms are only existed in color scheme, is there an API way to get rid if those rooms? it can be done one by one manually so i assume it can be done in API way.
delete redundant rooms in color scheme
Just to clarify: you are not researching how to delete redundant rooms in the model, but redundant colour schema entries for room types that do not exist in your current model. Is that correct?
Well, I never saw such a schema before in my life. Is it represented in the Revit database somehow?
What does it look like through RevitLookup?
As said, I have never heard of it, so it may be inaccessible via API.
If you delete those entries, is the deletion specific to the current project or does it apply to all projects?
If it is project-specific, it may be saved in the database.
If it applies to all, it is certainly not.
If it is in the database, it is probably just an Element object.
Subscribe to DocumentChanged and see what Element instances were modified by manually editing the colour scheme.
I bet you'll see a couple of modified Element instances that do not tell you what they are or what data they have.
Check their parameters anyway.
Maybe you will be lucky!
This is all part of the standard approach to research how to address a Revit API programming task:
