Production Seasons for long-term performances

Hello - I am looking for a new way to organise our Merchandise in ticketing set up. I have inherited a system of

Title - MERCHANDISE

Productions - MERCHANDISE

Production Seasons - MERCHANDISE (Season - Merch 15/16)

Performances - Each item of merchandise

At the start of a new financial year, my predecessor simply updated the end sales date for each performance and changed the campaign from Merch 13/14 to Merch 14/15, etc. This has worked in the past, requires little work and requires no changes to our website to update TNEW links, however, is not great for reporting and YoY sales comparisons.

Is there a way I can copy the whole Production Season and allocate a new Season to the copy, then update the campaign for all performances for the new financial year? Then the main admin would be updating TNEW links on our website.

Or does anyone have any similar set-ups or any ideas of how to manage this better for reporting?

Thanks,
Clare