Hi Glenn,
This is possible using the below methods,
1. If you have 3.x flow then by using return table
2. If you have BI 7 flow then you can achieve the same by following the below document
3. Expert routine - Just another option
4. Appending records in start routine or end routine. Same as it is mentioned in point 2
http://scn.sap.com/thread/610540
Regards,
Sujit.