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This Tutorialexplains the basis for adding Al's shoe meshes to Maxis meshes.
It is assumed that you know how to create a new mesh from Maxis meshes. If you don't, there's a good tutorial here.

Import your gmdc file in Milkshape.

Select the vertex bellow the knees on both legs .

Delete the selected vertex. They are not needed anymore because the shoes comes also with the lower part of the legs.

Import the shoes that you want to use in your mesh. Al's shoe meshes are in obj format, so, click on import - Wavefront Obj to select the shoes. The shoes are ready to be used, so they fit perfectly on Maxis Body Meshes. If for any reason they dont fit you just have to select the vertex in pairs and click on Vertex - snap together

It is usual that a Flat line separates the original and the new part of the mesh. Don't worry we can fix this easily :-)

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