Are there things in the expansion packs that also work together with the features of the expansion packs before it? For example, anything from seasons that also works with the exclusive features of OFB? Thanks

I'm not sure what you mean. All the EPs are backwards compatible, so when they programmed Seasons they programmed in the capacity to sell fruit in an OFB business if you had both EPs, but if you don't have Seasons, you can't sell fruit because you don't have it, and if you don't have OFB you can only sell fruit at the time of harvest because you don't have a produce stand to sell it from or a cash register to take the money.

Yeah, expansion packs work with each other. You can sell fruits from seasons, sell cars from nightlife, run nightclubs with nightlife + ofb, you can put restaurants using nightlife into Bon Voyage destinations, etc.

Oh, thank you very much! The sims 3 EPs do not do this very well at all.