Blender 2.81.16

I have to do a mold and I have several flat faces, and I need to reduce the face counts, also because I will use the obj file in other programs. I got to this point after working in the flat faces: Select area> X (remove faces) > select contour > Fill > Select Face (1) (first picture)

When I select Face (big) and Subdivide it makes a subdivision of a face in several small corners, not big divisions.

I think I'm doing something wrong because when I Export as .OBJ to another software, these big faces are not recognized (a hole appears in the object), (for example meshmixer). Do you know why? How it could be solved?

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To decide the Subdivision point I think I could solve the problem selecting 2 vertex and Fill, but I still have the problem of "ghost faces".


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