subdivide faces?

I know how to subdivide faces normally, but when i join a bunch of vertices together with the Ctrl+F and make face function, then i am not able to subdivide that created face all that happens is the edges subdivide into more vertices.

any help appreciated

thanx

Most likely the face you want to subdivide is a “n-gon”, a face with more than four vertices.

Subdivide = divide a triangle or a quad into four subpolygons of the respective type.
On any n-gon subdivide will indeed just divide the boundary edges (as it assumes you want to keep this face a n-gon).