All the expansion packs are combined together. You cannot play all the towns at the same time though. Your sim can only live in Bridgeport unless you move them to another town.
But you can very much live in Bridgeport, have a dog, have a kid that goes to Prom and have a vacation home in France. All at the same time.
I hope that makes sense and helped you!
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I will most likely not see your response. If no one responds to you within a few days, contact EA here: ttps://help.ea.com/contact-us/ask. For help with their website see this: http://sims3.crinrict.com/en/2012/10/how-to-contact-ea.html. It will probably be best. I hope it all works out for you - happy Simming!
