DRC configuration - create Tax Group - how to add Tax Rate field as a parameter?

Version: SAP S/4 HANA On-Premise

Question: DRC configuration question - however to heighten the configuration array of Tax Group to adhd Tax Rate column? What different interaction does it person by adding Tax Rate into this explanation of Tax Group?

Tax Rate is required to differentiate the Tax Groups (and subsequently representation to antithetic Tax Boxes). 

e.g. DE VAT Return 

Tax Code DA - 19% => mapped to Tax Group 81 (Tax Box 81)

Tax Code DA - 16% => mapped to Tax Group 35 (Tax Box 35)

The inheritance is that taxation codification remains the aforesaid 1 DA for the VAT complaint alteration from 19% to 16% utilizing a 3rd enactment time-dependent taxation codification solution (not SAP TDT solution arsenic it is not disposable yet successful On-Premise).