Design changes may require you to replace a part face with a sculptured surface or work planes. Use the Replace Face command to select the face to replace and the new face. A Replace Face feature is created and can be edited with sketch and feature commands.

What are tips for replacing part faces?
Can I use a work plane as a replacement face?
You can create and select one or more work planes to generate a planar replacement face. Work planes behave just like selected surfaces, with the exception of extents. Work plane extents are infinite regardless of the graphical display.
When editing a replaced face feature, changing from a single work plane selection to an alternate single work plane selection preserves dependent features. Dependent features are not preserved when changing between single and multiple selections, or alternate multiple selections.
You can replace one or more part faces with a surface, a quilt, or single or multiple work planes. The part extends or is trimmed to intersect the new face. The new face is trimmed to match the part.

If desired, select Automatic Face Chain to automatically select all adjacent tangent contiguous faces.
To edit the new face, right-click the Replace Face feature in the browser, and then select Edit Sketch or Edit Feature. As long as the part completely intersects the new face, the feature updates with the changed values.
When editing a replaced face feature, changing from a single work plane selection to an alternate single work plane selection preserves dependent features. Dependent features are not preserved when changing between single and multiple selections or alternate multiple selections.
Replaces one or more part faces with a different face. The part must completely intersect the new face.
