SELECTALIGNEDFACES command
Selects all faces in a model that are coplanar with a selected face.
Icon: 
Method
Select a single face. The program selects all other faces that are in the same plane, shown outlined.
Selects all faces in a model that are coplanar with a selected face.
Icon:
Select a single face. The program selects all other faces that are in the same plane, shown outlined.