Combining phases - rooms?

[koleary_ksa]

I have a multi-phase project that is complete and I am trying to clean it up to be an existing model for that building moving forward. If I start combining phases, what happens to the rooms? Do the rooms stay from both phases that are combined or do the rooms from a later phase stay while the earlier phase delete? Thanks!

[vitorbortoncello]

The rooms don't combine or delete; they remain based on the phase you're working on

[barthbradley]

FWIW: 

https://www.youtube.com/watch?v=mcsB7D-vtFM

[HVAC-Novice]

You can vote on these ideas to allow that:

https://forums.autodesk.com/t5/revit-ideas/add-rooms-and-spaces-into-phases-and-design-options/idi-p...

https://forums.autodesk.com/t5/revit-ideas/phasing-rooms/idi-p/8650858.

Not being able to change phases of a room or space is a serious lack in capability.