ok, thanks
Though I wasn't talking about the command "full crease" or "partial crease". That was my bad in explaining and I apologize for that.

Anywho, what I was talking about was after moving the vertices myself to create a sort of looking like crease, it wouldn't show up after converting. However, silly me, I think the problem was that I wasn't moving the correct vertices that get exported in the conversion. I am going to retry and see if I get it right this time and I will let you guys know if this was the case.