Hi comment.
Your analysis of my amateurish explanation is correct. The report is based on the childitems table.
In the screen grab below, the text in red should be where the sequential case number should go based on how many cases are found that have the status "Yes" (as in "Ship? Yes or No").. So Microwave TX would be case number 1 and mini Eclipse AKS would be case number 2 etc etc.
I'll try and implement your suggestion and thank you very much for your help. Greatly appreciated!