Barcoded Serial No. Despatch Label

Greetings from the UK
Anybody out there printing these?

The standard (Crystal) packing slip outputs the serial number. However
it is a single block of text separated by commas for each serial
number.
The Crystal help suggests a formula for separating these - but if we
have
200 serial numbers for one line on a Vantage sales order - that would
mean
at least 200 formulas - (a very slow print run!).

Alternative is a report builder 'report' - but would prefer our
solution
to be integrated with the packing slip print button.

Any ideas?

Rob