Hi Vu, The Component Family Void is for creating Family Void Elements.
What are you trying to Cut?
For Walls and Floors you can use the Opening Components

Here’s a nice example of using Voids in Families
Hi Vu, The Component Family Void is for creating Family Void Elements.
What are you trying to Cut?
For Walls and Floors you can use the Opening Components

Here’s a nice example of using Voids in Families