How to use Floor From Detail Line tool:
1. Select button FloorFromLine to trigger the Add-in
2. Select Revit detail lines that you want to build the floors/ slab foundations from.
3. A dialog will appear to request you select:
- Floor Type
- Level
- Floor Offset
- Structural or none-Structural floor
4. Click OK
The below video will demo step by step.
Thanks for watching!