You can use the Room Division tool to manually split a floor. You may, for example, want to create two different floor areas in one room. You can also use the Room Division tool to define an opening in your floor. Floor edges defined with the Room Division tool can be moved to increase or decrease the size of the individual floor area. They can also be deleted if necessary.
To divide a floor:
Select Insert
> Room Division, or click the Room Division button on the Building
toolbar.
Select points to define the division line. If you are dividing a floor surface into two segments, the end points of the line must be on the floor edge, although intermediate points are permitted anywhere on the floor surface.
If you are creating a floor within a floor, the split line must form a closed shape.
Right-click and select Finish.
To move a division line:
Click on the dashed division line in 2D plan view. Blue grab handles are displayed along the line.
Hover your pointer over the center grab handle, then click and drag to move the line.
Release your mouse button.
Note: When you divide a floor, the division lines are also created on the ceiling above.