Attached wall height

This is quirky.

For instance, if we have a 15' unconnected wall and then attach

the top of the wall to a floor at level 1, which is at 10'. The wall properties still says that the height of the wall is 15'.

Revit also shows that the "Top is Attached". Changing this height in the properties does not change anything apparently. However, selecting the wall and clicking the "detach" button in the option bar,

to detach the wall returns the wall to the actual height shown in the properties.

(even though the wall height shows incorrectly while the wall is attached, the wall area, etc schedule correctly!)

Splitting spanning walls horizontally

We had a shaft wall that spanned many floors. During the DD the shaft wall was moved on each floor, in such a manner they didnt align. Changing the spanning wall to go up to only one level resulted in lot of "Rooms not defined" errors in Revit.
Fortunately the "Split" command works in the elevation too. If you split at the Floor level, the split wall gets constrained to the level too. (Splitting also keeps the wall tags intact!)