Insight - Asset Management
SINCE VERSION 3.2.2 sumUp supports Insight fields in gadgets so that e.g. grouping can be easily done.
Using Insight fields in dashboard gadgets
Once Insight custom fields are configured, they can be added to our Gadgets to display all relevant data or to be used for grouping.

Insight and calculation rules
It is possible to create sumUp calculation rules for Insight custom fields. However, they will never be executed so that no value will be calculated.
There is no need to define calculation rules for them.