Openvz Reinstall/Change OS Template

Anyone know how either I or the user can reinstall their openvz vps OS/template. There doesnt seem to be a way to edit/change the template. Many users that I have one solusvm like to try different OS and would like the ability to change when they want. I dont see that option in proxmox for them or even me which has full admin rights. Do i have to do it via cmd line and edit the conf file?

Thanks