Subdiv Surfaces > Polygon Proxy Mode

User Guide > Modeling > Subdivision Surfaces > Subdivision surfaces menus > Subdiv Surfaces >

Polygon Proxy mode is a display mode for subdivision surfaces that displays a polygon mesh that corresponds to the base mesh (level 0) for the subdivision surface.

In Polygon Proxy mode you can do the following:

Edit the subdivision surface using the polygon tools.
Switch between Polygon Proxy mode and Standard mode at any stage of modeling using the marking menu.