The Split Face tool splits the selected face of the element; it does not change the structure of the element.
You can use Split Face on any non-family instance. After splitting the face, you can use the Paint tool to apply a different material to this section of face. See
Applying a Material to the Face of an Element.
Video: Use Split Face and Paint Tools
To split a face
Click Modify tabGeometry panel (Split Face).
Place the cursor on the element face to highlight it. You may need to press
Tab to select the desired face.
Note: The sketch must be in a closed loop inside the face or an open loop that ends on the boundary of the face.
Click
(Finish Edit Mode).
Tip: You can split the face of a column. However, if you plan to have multiple instances of the split-face column in your project, create the column in the Family Editor and apply the split there.