Load L'Homme into the scene from the library.

Select L'Homme and choose  Figure > Load Full Body Morph

When the Load Morph Target dialog appears, click the top button and select your OBJ morph target.

Enter a new name (other than Body 1) in the Label field.

Click OK to load the full body morph.

After it appears in the parameters palette, dial the morph to 1 to make sure it all loaded properly.