Fist question: I don't know of a site where you can see all the pricing after a promo. I recommend chatting with a U-verse rep, they will be able to answer those questions. You can go here and a Chat link is on the right.
Second: When paying a bill, your payment will apply to the entire balance, there is no way to specify which part you're paying (I assume you mean Internet/TV/Phone). You bills will actually have a breakdowns of services and prices, so you'll be able to see how much each service is billed for.
Third. No, only one U-verse account is allowed at on address.
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