Split Elements in Revit for Assemble Integration

One column at a time

1. Select the column.
2. Under the Properties -> Constraints -> Column Style -> Slanted.
3. Select the column again -> Modify -> Splice.

Multiple columns at once

1. Select and Group all columns you want.
2. Go to the Project Browser -> Group and find the group you just created.
3. Right click on the group and save as rvt.
4. Insert -> Link Revit -> Find the file you just saved -> Origin to origin.
5. Collaborate-> Copy and monitor-> select the linked file.
6. Options -> Columns tab -> Check Split Columns by Levels.
7. Copy -> Check Multiple -> Select the Columns -> Finish (by the multiple checkbox).
8. Go back to Copy/Monitor and hit Finish again.
9. Now you can delete the link and the group.

I encountered with the problem that this building has a Level 2 TOS level and a Level 2 level which made the following happen:

To fix this, I deleted the extra section and change the base level of the upper column to Level 2 TOS.

Splitting Walls

Before

After

Splitting Slab

Splitting Roof

Had to modify sub elements and then the slab.