Subdiv Surfaces >
Partial Crease Edge/Vertex
Partial Crease Edge/Vertex modifies the appearance of a subdivision surface by applying an edge shaped feature along the selected region of the mesh.
Applying a crease is useful when you want a sharp edge or transition on a surface. You can also apply a full crease, or uncrease previously creased regions of the surface. The feature produced by a partial crease appears less pronounced on the surface than a full crease.