Amount 2019 Fees that purchased 2020 season perfs

I've been asked a tricky question by my CFO. Before I solve it in the Database I want to try filtering in Analytics

I have about $19k of ticketing fees in 2019. Do you know what value of these relate to 2020 sales?

We use 2019 Fees from January to December 2019 and flip over to the new year in 1-Jan-2020.  Because we start selling 2020 shows in September 2019 there is a number of 2019 Fees that were accumulated in orders for the 2020 season.

Now this is of course a fuzzy question because order can contain all kinds of things 2019 and 2020 both but what I've like to do is only return Fee Value where the Order ID contains a particular 2020 Production Seasons

I'm scratching my head about the Analytics formula. In SQL I write a select where Order ID contains - search for the Order IDs with a 2020 Prod Season No.

Any thoughts?

H