Reporting on deleted/added line items

Hi,

I manage the school bookings at Arts Centre Melbourne, and I’d love to be able to report on when and by how much schools are changing their booking numbers before payment is made.

Does anyone have a report that displays this information that I could use, please? 

The information I am trying to get out is

• how often schools change their numbers;
• how close to the event date that happens;
• whether it happens more with bookings in one MOS versus another MOS (we have multiple MOS for schools); and
• the number of the tickets adjusted.

Thanks so much!