The article outlines the steps to create a non-stock credit note
FOLLOW STEPS BELOW:
1. Click 'New'
2. Select 'Credit Note'
3. Select 'Customer' or 'Sub Customer'
4. Use search to find and select desired customer/sub customer
5. Click Select
6. Enter a Comment
7. Click up arrow to minimize credit note header
8. Click coin icon to add non-stock item
9. Select non-stock type from dropdown
10. Search and select desired sales rep
11. Click binoculars icon to select Job to link non-stock item to
12. Enter units
13. Enter local price
14. Enter reference
15. Enter comment
16. Click OK
17. Add any other non-stock items
18. Click Complete
NB. For a quick tutorial watch below