Crystal Reports 10.05.1609; SQL Server 2008R2 - Multiple Parameter, create new code to group several

[hmax]

Crystal Reports 10.05.1609
SQL Server 2008R2

Crystal Reports - multiple drop-down parameter, create new code to group several drop-down codes together.

Example:

Parameter Multiple drop-down
Code Description
AA Language A1
TQ Lanugage A2
WR Language A3
SP Language B1
DF Language B2
GK Language B3

The user can choose one or multiples from the drop-down parameter.

Now, I need to create a new code to group together, for example, all A languages, e.g., new code might be CL, containing (AA, TQ, WR).

Thanks in advance for your help.

 

[Charliy]

( ({?parameter) = 'CL' and {table.language} in ['AA','TQ','WR']
OR
({?paremeter} = 'XX' AND {table.language} in [ list of codes ])
or {table.language} = [?parameter} )

 

[hmax]

Thanks, Charliy!