@User does Openlane support MSV(Multi supply voltage), MSMV(Multi supply multi voltage)?

Not really but there is some work by @User in this area

What is your use case @User

@User @User I have a couple of question: Are there different libraries available for Sky130nm like lvt rvt and hvt devices? And if yes is it possible to do a multi vt run through OpenLane?

You can see the docs at https://skywater-pdk.readthedocs.io/en/main/contents/libraries/foundry-provided.html