Family not cutting mutiple objects

A Door or a Window can easily cut multiple objects.
But what about other objects hosted in a Roof, Floor or Ceiling...

Open the Family. Uncut the Void from the Host object.
Ensure that the Family has "Cut With Voids When Loaded" enabled.
Load the Family in your Project.
Now you can manually Cut the Void in this Family with Ceilings, Floors Roofs, just as you like. 
I know it sounds basic. But still good to remember from time to time.