1. From the App overview, create a new sheet and enter the Edit sheet mode.
2. Add the Dimensions field on to the main content pane.
3. Drag a Bar chart object on to the content pane.
4. Add the following expression as a measure:

Sum(Sales) 

5. Add the following calculated dimension by clicking on the expression button:

=Pick(Match($(vDimension),'Weight','ProductType', 
   'Category'),Weight,ProductType,Category) 

6. Enter one click of the space bar as the label to make it appear as if there is no dimension label.
7. Exit the editor mode, and select a value in the Dimensions field.
8. The final product should resemble the following screenshot: