Best way to have custom verticies for mdl0

[PlagueX]

I basicly want to know how i can have my own custom verticies for an mld0. I was searching up how to do this and didnt find an exact answer, but found some helpfull information. From wat i read u can edit the verticies of some other file type in a vertex editing program (like anim8tor) and then convert it into an mdl0 and then u do something else. but im not sure how i wld do this or if i am even close on how to do it. Can someone explain wat u wld do for this, like give me the steps on wat to do? By the way i NEED to know how to do this for a map object rather than charictor vertex editing (just saying this incase there is a difference in editing the verticies for each).