The slab clearance hole command is used to create a slab void gap in steel floorsslab.
Click theSteel Composite Slab icon from the toolbar ribbon menü.
Click the Draw Slab VoidHole icon from the Slab for Steels toolbar for Steel .
Select the floor slab you want to open.
Select your continuous elements that define the boundaries of the slab spacehole.
When you click the right mouse button, your space hole will be created.