Sometimes it's necessary (or more convenient) to achieve our desired outcome by taking one file and running two different Formula across it.

A common example would be files that have a mix of Individual and Organisation records. One Formula for the Individual import, and another formula to do the Organisation import - the Organisation import would add and link the individual as a Contact against that Organisation. Fancy.

Right now custom routing lets us skip some rows, having the Formula ignore them. This let's us have our two import formulas, one for Individuals and one for Organisations.

But it would be amazing if Custom Routing could take those skipped rows and send them to the second formula. You run the file on the Individual formula, and then the rows that have Organisation data get sent to the second formula automatically. Both imports run, you get your desired outcome and your formulas are much cleaner to document and maintain.