Creating new DataSet on Calling Base Class

Question

I have a Base class "BaseClass" in this class i will be creating a New Dataset (Protected) for my Transactions, i will be calling this Base Class from various Sub Classes. Suppose Calss1 calls a base class and in the same way Class2 calls the base class. At this point i will be having two datasets created. but i need to send only one dataset to the other layer. how is this possiable.