But I have seen a lot of creators have put together neighborhoods from the Harry Potter series (Godric's Hollow, Hogsmeade, etc). I was wondering can these neighborhoods go into one Sim neighborhood (1 game), or do they need to have separate game neighborhoods/multiple games?

Um, hmm... that might be confusing, how to explain better...

At the start of each game, you have neighborhood you play in that you can name... can multiple neighborhood content from creators, as listed above in the example of ones I've seen, be loaded into a single Sim neighborhood if that neighborhood was named Wizarding World, for example, instead of "Godric's Hollow" or something?

Please excuse my ignorance in the game play, as I've never really played Sims for long (my husband has been using my computer for school), and never before with downloadable content.

Technically, yes, it's possible (if you have Nightlife or Open for Business) to have a main neighborhood of your choice, with whatever other neighborhoods as either Downtowns or Shopping Districts attached. It is, however, a Big Pain In The Ass to make happen.

You'd essentially use this method: http://simswiki.info/wiki.php?title...s_Neighborhoods ... only with the custom hoods rather than Maxis. Be sure to prepare both copious amounts of coffee (for drinking during the process) as well as alcohol and tissues to drink and cry into, respectively, when it inevitably goes wrong.

HAHAHA I think I'll just stick to Hogwarts for now... using the movie castle version. LOL What drives me nuts is that I have to check everything I download to see if there's meshes or what not that I have to download separately. Usually there is... and lots of it. I probably COULD do it then, as I finally got all the eps and stuff packs... for Sims 2 at least.

When I built my Potterverse, I found it was much more straightforward to download the individual lots from those collections and construct the neighborhoods fresh from them. I have one big central neighbourhood, called London, with different subsidiary neighbourhoods for different places. I don't have an individual Godric's Hollow; instead, a tiny corner of London is filled with lots associated with that village. Ditto for Ottery St Catchpole. All of the main Potter families live in various parts of the central neighbourhood.

However, I do have a Shopping District Hogsmeade attached to London, with various Hogsmeade lots that I arranged to my liking. My Hogwarts is a University neighbourhood (magical Sims leave for Hogwarts as soon as they age to Teen). That's probably the easiest way to reconstruct the world: one central neighbourhood with self-constructed attached villages.