Hi Karl,
Currently, it is only possible to enter a single beer duty reference number in your beer duty settings. This number is stored solely for your convenience and reference when submitting beer duty returns.
If you’d like the option to enter a separate beer duty reference number for each site group, you will need to submit this as a feature request so it reaches the right team for review.
You can find out more about feature requests here: 💡 Posting ideas & feature requests for Breww 💙
Cheers,
Connor