Hello all. I'm taking over an existing website and need to move it to a reliable and stable host

I will be using Windows hosting as the website is built with asp.net. The website currently has a main "section" and 13 "sub-sections" in it, for 13 groups within the main organization. Each group has their own ftp account to upload html into their own little space. Will I be able to accomplish similar functionality on HostNexus? Are sub-domains the best / safest way to do that? I like the idea of using "groupname.website.org" as their ftp address ... much easier to remember than the IP addresses they are using now!
Thanks for any help you can give.
Dave