While working with families in the
Family Editor, you can select which geometry does not get cut when you join geometry.
In the
Family Editor, click Modify tabGeometry panelCut drop-down (Uncut Geometry).
Select a form.
Select the appropriate solid geometry that you do not want to cut. If you do not want to cut multiple elements, select Multiple Uncut from the options bar.
Note: If you select all geometry to not be cut, then the form appears at all times in the view.