Characteristics Value Groups on CO-PA for KE30 Report

Hi gurus,

is it possible to group some characteristics value and use this groups as variable selection in CO-PA reports?

For example I have the Characteristic "WWTYP - Product type" with value "A1, B1, B2, B3, C1" and I want to group "A1, B1, C1" to let be selected in KE30 Reports in navigation mode (so after the report launch in classical mode).

How can I do this?

Thanks in advance for tips and answers!