Bring your sample and we will show you. Or just try following
1. bring all you measures and dimension to Marks card if they are not in view but would like to use.
2. then click your Tooltip and Insert
3. Then place measure and dimension where you would like to dynamically to change:
<Count(Article)> articles from <Dimension1> area making [Sum(Sales)] sales while <Count(Article1)> articles from other department is making rest of the sales
I hope it helps.
Please let us know if any solution above helped you to solve your porblem. If so, please marked it as correct answer so that it is cleared from question board that needs to be answered and others also can benefit from it. If not, please feel free to ask.