GL Account Grouping Method

In SAP/S4, what is the proper method to create custom groupings of GL Accounts that do not follow a logical range? This method should also be easy to administer as this list will by dynamic with GL accounts being added or removed from the logical grouping.

Example: I need SAP system to send to an external vendor a weekly master GL data file of custom grouping of GL accounts that are permitted for PCARD expenses. I do not want to send the complete list of GL accounts and would only like to send the custom logical grouping which are determined by the business.