How to cut a face - on one side

Hi all

Is there a way to make a cut on one side of a face only? Loop cut and knife will join the vertices together where I’m after something like the cut function in Wings, select 2 edges and can cut just the face between them…

Hope that’s not too much of a complete noob question :wink:

Is this a good way to do this?

Select the face I want split
P to seperate
Subdivide or loop cut it
Select both objects
CTRL J to join them back up

To do what you require would mean N-Gons, which blender currently dosnt have.