Fender lip roll up

You'll need to make a series of cuts as deep as the extra width needed. then bend each section between each cut. the problem is that there are 2 layers welded together and essentially, 1 needs to get longer while the other gets shorter. this will cause buckling. the other(preferred by some) option is to cut & re-weld. Seal prime & paint either way. A pro body man will probably have better advice.