You're not limited by using standard element categories only. Add your personal tag categories with any name and color.
For example, you need a new category, which is not reflected in the breakdown results, or you need a specific category for your unit. The custom category feature will assist you.
Procedure
Open the tags menu.
Scroll down until you see the ADD CATEGORY button.
Name your new category and choose any color.
Voila!
Then you can find your new custom category in the breakdown Summary section.
Tip At this moment, it's not possible to mass delete or edit tags. This feature is in development now. But there's a hint to achieve just that: find all the items and then remove or edit them one by one.