People drill down data by some axis.
For example, sales amount data can be broken down (drilled down) by area, by branch or by product etc.
It is technically possible to drill down by any axis but you may find it not practical at all when you try to apply the results into your business. Why.
From my experience and survey, I found three major points you should consider when you select the axis for drilling down the data.
One of the three is “Impact to the goal”.
You need to make sure the consequence of using the axis will effectively contribute to or affect the goal finally.
You can break the data by customer location (area), for instance. But if the business is internet shop, then location does not matter at all. I know this is a too simple example, but people tend to skip this exercise when they simply use some axis to break the data.
The question you should ask would be “Is the axis really a key driver to the goal?”.