In case you want to explore some part of your results more thoroughly and use it as a source for charts - you can use Drill Down.
In order to activate a Drill Down (child) dashboard of certain gadget, first you should go to Advanced settings of your gadget and turn on Drill Down switcher, then click on Approve button.
Note: your gadget's Math function setting must be set to Count parameter in order for Drill Down to work. Drill Down is also not available for gadgets built against any System column of your source.
Then to create a Drill Down Dashboard -> click on one of the chart segment (category) and a following popup window will be shown:
After approving you will be redirected to a Drill Down Dashboard related to the chosen category within a specific gadget:
"My first dashboard" is the name of your parental dashboard and "NPS pie chart" (in the brackets) is the title of gadget against which segment a child drill down dashboard was built.
The blue indicates that you're currently at the child (nested) dashboard and by clicking on it you can move to the parental dashboard.
After creating a Drill Down, you'll see a special symbol near the parent gadget: