If you want to have your Zap update a different record in an app every time it runs, you'll first need to use a search step to find that record. Search steps are a way to find existing data in your apps that later actions in your Zap can reference and use.
Before you begin, you’ll need to set up your Zap trigger.
For example, you might want to set up a Zap so that every time you receive a new Google Forms submission, it adds a comment to a different Trello card depending on how the form was filled out. In order to update an existing Trello card, a search step must be used to first find that card based on some criteria.