Hierarchical Treemap
Select the chart type as Treemap, add one measure and one dimension, and set the finest level of the dimension to display and check the Include Parent Levels property.
The treemap will display the weight relationships between members of this hierarchy regarding this measure value:
Multi-dimension Treemap
You can also display treemaps between multiple dimensions, add multiple measures, and do not set the include parent levels property.
The treemap will display the weight composition relationships between multiple dimensions regarding this measure value: