Users can manually create their number series by typing the credit note number in the Credit note #. 

1. Click on Credit Note 
2. Click on the '+' sign to generate a new CN
3. Manually add CN number in CN#, e.g. Moon CN 1
4. Enter other credit note details and click on 'Save.'

After creating the new CN series, all the upcoming credit notes will be saved in the succeeding number—for example, Moon CN 2, Moon CN 3, and so on.