Split a Face

On the Surfacing toolbar, click the Split Face button .
Select the surface that you want to split and then click the Accept button.
Select one or more elements that intersect the surface you want to split and then click the Accept button.
Click Finish.

Tip:

You can select curves, surfaces, reference planes, and design bodies as the elements that split the surface.
When you use a surface as the splitting element, the surface must physically intersect the surface you want to split. When you use a reference plane as the splitting element, the reference plane must theoretically intersect the surface you want to split (the reference plane is considered to be infinite in size).
When you use curves or edges as the splitting elements, such as a sketch to split a face, the splitting elements must lie on the face you are splitting. You can use the Project Curve command to project the elements onto the 3-D face.