No, there isn't a way.
You can have just one instance of a data set showing in a given process flow. However, you can create multiple process flows, and a data set can appear once in each flow with tasks attached to it. You can "move" tasks from one flow to another by:
1. File->New->Process Flow
2. Right-click on the task you want to move from "flow1", and select "Move to flow2" (for example).
Chris