Please consider below screenshot
We can see that the tasks and corresponding items under it are properly grouped in a tree hierarchy. I wasn't able to figure out how I can manipulate this hierarchy in excel or create one from scratch. Please advise.
Please consider below screenshot
We can see that the tasks and corresponding items under it are properly grouped in a tree hierarchy. I wasn't able to figure out how I can manipulate this hierarchy in excel or create one from scratch. Please advise.
It's called an outline or group, and can be done on both rows and columns. For a more technical in-depth explanation, check out the Office Support page on the topic (Or google excel grouping).
You find the options for this under the Data tab:

But you can also group via the shortcuts Alt+Shift+→ (add) or Alt+Shift+← (remove) while having the rows or columns selected.
CTRL+SHIFT+RIGHTto create a group, andCTRL+SHIFT+LEFTto remove a group. Or go into the Data tab, and find the buttons for it. – Christofer Weber May 06 '19 at 22:19