I think you actually did it already with option 1. You should be able to see the other data sources above dimensions (if there's a box around the data source, it's a drop down menu), and in the Data Source tab (click the icon next to the data source name at the top middle ofthe screen).
Hope this helps.
Hi Jeffrey. Thank you for your response. For some reason, it is replacing the current data source. It is not adding a new one. It's as if there is a setting somewhere telling it to replace instead of add, but I can't find anything like that.
Is it possible for you to attach your packaged workbook here?