
So, we do a lot of hotels and multistory residential buildings. In schematics when we work on unit layouts (either hotel or condo units) we keep demising walls independent but we create a Revit Group for each unit type and we put in it interior unit partitions, doors, plumbing fixtures etc. It works really well because once a unit groups are being developed you can just populate the rest of the building with them. Then make adjustments to one instance of a group will update the rest of the instances. That works nicely when you have the same floor-to-floor on the levels that you populate these groups on but not so much when you want to stick the same unit on a level where floor-to-floor is different.

What we decided to do to simplify things and not to have to create a new group for the same unit with a different floor-to-floor we just kept walls in groups as “Unconnected” with explicit height setting – which works well until you cut a section.
Long story short – my colleague Juan Alvarenga suggested a solution. It appears that you cannot differ wall height from one Revit group instance to another but you can actually use “Attach Top” to attach a wall to a slab or ceiling in one of the group instances (if they are “Unconnected”) on a grouped wall and Revit will allow that! See image below. Problem solved…
You still have to click attach to top each time though so doesn’t really save you the time.
That is right, Scott. You will have to attach it, say to slab above , or a ceiling but just once (as long as the slab stays there). Not ideal, but I still find that to be a better solution than managing an extra unit group though.