Subdivide Face icon Subdivide Face

The Subdivide Face action splits each selected face. To do this, it adds a vertex at the center of each edge and connects them in the center.

You can use this action with the Alt/Opt+S shortcut, or from the ProBuilder menu (Tools > ProBuilder > Geometry > Smart Subdivide).

Split side of cube into 4 squares

This allows you to add a lot more detail to your geometry. Alternatively, you can use the Cut tool to control the exact shape of the new faces.