We are working on integrating Prophet with Pentaho .

Pentaho Business Intelligence provides great OLAP and cubic reporting for sales analysis. 

For Prophet users this is similar to Attache's Sales Matrix add on, but with a richer selection of capabilities.

We have the Pentaho default demonstration system installed here .

The key issue is migrating Prophet specific data formats through Pentaho's Kettle into something useable, and building the cubes. We are creating a default set, that we can then amend for specific company setups. 

Is your product group a subset of your stock categories, or the other way round, or are they not related? Do you use flexi data fields for additional segmentation? Do additional dimensions need to be stiched in from Excel.

When we have Prophet data ready, we will change the online demo to Prophet demo data, and update the details here.