Hi Gul,
Yes. Select the process/flow from the side bar and drag/drop it either on the input or the output. If it is a process, the provider process would be assigned to the flow automatically. If it is only a flow, then you will also have to add a provider process (if it is a product flow)
Also, if a standard flow does not exist, you need to create a flow and the associated process first with relevant flow and process level details.