How is this done? I want to build a cube against a Package, but I am not aware of how you filter the data.
Why not build a report off of the package and use a filter in the report? That would be your datasource.
Sounds like that is the best option. I was wanting/hoping that all of that could be done from within Transformer. Maintaining 2 files (FM Model and Transformer Model) is better than maintaining 3 files (FM Model, Transformer Model, and Report Studio Report). At least that is what I was envisioning. It seems kind of silly that you can source from a package, but not tell it how you want to filter it.
I think you're misunderstanding how they should be used. If you really want to filter the data using a package, you would make the the filter in Framework Manager and re-publish the package. That's more in-depth then changing a filter in a report.
Using a report is more setup time in the begining, but easier to change later on. Using a package is easy setup, but harder to change later on.
You also have to remember that it's pretty simple to create a list report off of a package :)
You can always add a filter in your Package.
When it is published & avaliable, when you "Modify Columns" on your query in Transformer you can add a filter which will reduce your result set.
Then you can always update the Filter in the package and it will automatically update any models that use it.
Cheers