Loop cut problem

I am having trouble making loop-cut on this particular face. The face is selected in the picture


I am attaching the .blend file as well for your reference.

Attachments

Test.blend (454 KB)

It’s because the loop cut needs all quads. Because of the subdivided face to the side, the face that you are trying to loopcut actually has 13 sides.

So how to fix that? I am facing similar issue in retopology. So I made a similar situation for demonstration.

Delete the subdivided faced in the middle and create a new face, then loop cut it.

how to delete the subdevided face? And what if in a situation where I can’t delete that, how to fix it?

It’s an n-gon face that doesn’t loop cut. Could cut it with knife (K) or vertex connect path (J).

The whole example shows a non-manifold error, interior face, where both n-gons connect to one cube edge. That edge now has three faces connected instead of two which describes an impossible surface.