Hey Patels23, I don't have a conclusive answer for you as I haven't been following very closely for the past month, but you might benefit from upgrading them one line at a time. I don't recall the rules to the letter, but the essence was that individual lines within family plans were not automatically forced into Share Everything - I remember asking a rep because I couldn't quite understand how a mutant Family Plan/Share Everything Plan hybrid would work if individual lines selectively switched over; I remember the math showed it to be a horrible scenario. So I don't recall precisely the conditions under which you are or are not required to convert a full account to Share Everything, but I do recall it being generally at the consumer's discretion. As long as you maintain that core nucleus of lines under a Family Plan, it's easy to justify the retention of Family Plan terms for an individual line's upgrade, which you can do iteratively (Upgrade line A alone, keep the other 3 in the family plan. Once A is upgraded to new family plan terms then upgrade line B, maintaining the other 3 in the family plan (2 under old terms, 1 under new terms). Once upgraded, then upgrade line 3, etc.
Thing is, you should probably look carefully into your data usage first, because it's not necessarily the case that Share Everything is a bad deal. In most cases the bill seems to come pretty close, giving up only the security of an unlimited package which might be overblown in many cases. I fought tooth and nail to keep mine just for the principle and insurance against overages, yet I've never even used 2GB. Considering the 2 1/2 days I took off work to scour forums, research the issue to death, stop into Verizon stores, etc, I effectively lost an extra $400 up front to keep an unlimited plan that will likely pan out to have zero financial value aside from the warm fuzzy feeling that I can stream media to my heart's content while away from WiF. Despite picturing a million scenarios where I'd need that ability, I see now that I basically gave up a new iPad 4 for the option to watch Netflix that one time over the next two years I'm stuck riding in a car all day (which already happened and I didn't watch a lick of Netflix. Would rather have the iPad 4 with certainty every day for those two years and 'live' with 2GB data on that car ride.) So the advice there is that it's not necessarily a good deal to invest a ton of time in getting every contractual term you desire if it consumes a lot of your time resources, but I guess that's why you're asking for the answer instead of reading 46 pages of thread.
For the specifics I'll defer to Jtludwig above: the answer is in there. (But do be careful; I have to disagree with the statement that it will be clear during the checkout process. See my post #205 ITT from several months ago, I provided screenshots of the order process and resulting receipt that were anything but straightforward. In fact the website's representation at that time was blatantly wrong, though to my benefit so I'm not complaining). Good luck. My advice is to pay for the Note 2 full price and get back to your life, or just let go of unlimited if you're only keeping it for insurance. Stomaching a $100 data overage at some point might actually be the cheapest solution, as crazy as that sounds.