Hi Prakash,
It's easy to make hierarchies to make drill-down operations.
![](https://www.edureka.co/community/?qa=blob&qa_blobid=16543938161324310828)
A hierarchy will be formed when you drop a field on another field.
![](https://www.edureka.co/community/?qa=blob&qa_blobid=10730850967189768074)
Deleting any member from the hierarchy would delete the actual field.
You can duplicate the field used in the hierarchy to use it as a non-hierarchial field for some calculation or visuals.
The hierarchy order can be changed as per user.
In the below image, there are not in hierarchy.
![](https://www.edureka.co/community/?qa=blob&qa_blobid=16207962995344017203)
In below image, there are in hierarchy, where - indicates the hierarchy drill up and + indicate hierarchy drill down
![](https://www.edureka.co/community/?qa=blob&qa_blobid=11080959402129784228)
Hope it helps you.