Another option is to concatenate issue and part number and then group on that. If issue is a number type and not string, there will be a trick to get this to sort correctly:
1. Determine the maximum length of the issue number - I'll use 5 for my example.
2. Add leading zeros to the number - right('0000' + totext({myTable.Issue}, 0, ''), 5)
3. Add the part number to the end of the resulting string.
-Dell
