JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. Edit Form Base Changes the shape of a free form or slab by modifying the base element. Accessed from: Ribbon: Building Design > Forms > Modify Forms > Edit Form Base Key-in: TFMODIFY BASE EDIT Note: Cannot be applied to a linear form; cannot be applied to a free form (smooth). To modify a free form or a slab form Parent topic: Modify Form Base