1. Select either the Composite Floor System tab or the Concrete Floor System tab
2. Select the Decking or slab Property to be deleted by clicking the desired Decking Property in the Decking Property list box. That entry will be highlighted and the values for that property will automatically be entered into the other dialog box controls.
3. Click the Delete button. The Decking Property will be deleted from the Decking Property list box.

If the Decking Property is currently assigned in the model, a warning message will be issued and the decking will not be deleted. If you want to delete it, you must first remove the deck assignment from the model through the Layout - Slab - Deck Assign menu.