We shorthand deed to mean contract, but it's the same thing. I did a deal with two deeds at once. They had separate numbers and their own paperwork. Closing was a little cheaper than two unrelated deeds, because they are all in the same transactions, but more than one deed.
They probably mean all the deeds are under the same seller membership. They will look like this: number.001, number.002 and so on.
Make sure you have separate paperwork for all of them, obviously. You can break them up and sell them individually, which is a big benefit of buying this way.