this has been asked many times before, and the best answer that I have heard is to create a table/import a table that is basically:
1
2
3
4
5
6
...
then you can select the label and join it the number table where labels.needed <= number table. CR will bring in the 'duplicates' and you are set.
The original poster had the number table as an Excel spreadsheet, we have a numbers table in our database
HTH