Financial reporting based on class

I'm trying to build a custom income statement based on the class filter in order to classify all revenue/expenses related to an event we are participating in. All of the revenue comes in through Shopify so it's automatically classified in our "retail" department. i plan to go back and manually update all the revenue from this event with a specific class of "Event XYZ." I've noticed that when I filter an income statement by class, it takes into account the class from the line level in each transaction, rather than the transaction class. Is there a specific filter that will