Adding User fields to signup?

What I'd like to be able to do with each plan is add a new value say called "support plan" that would add some extra value services to our plans if they choose (for a price) they could pick from a Bronze, Silver, Gold, Platinum, etc. plan and be charged appropriately for this new level of service. Can Hsphere do this somehow? Was trying to figure out custom values but had no luck. Thanks!
 
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