Add possibility to group and give custom names for reporting period

[simphide]

Is your feature request related to a problem? Please describe.
I currently have a lot of reporting periods for custom reports. What would be super helpful if you could group reporting periods and especially give them custom names.
E.g. "Performance since Trump is in the office" etc.

Describe the solution you'd like
Add an option to enter a custom name & group the periods. The list of reportin periods would then show the custom names and would include unselectable entries which could be used for the group names.

Describe alternatives you've considered
Trying to just sort them, but that wasn't super sufficient.

Additional context

Thank you in advance!