I’m surprised this hasn’t come up more often when browsing the community- 

This was asked over on: 

How are Support Leaders exporting or extrapolating important customer data points in order to provide better insight to the rest of the organization about what Support Teams are talking with users about? 

For example:

If I have a conversation data point called Category with a list of relevant things about our product, I would like to create a Sub-Category conversation data point that allows me to break this done. 

This feature has existed for almost a decade in Salesforce.