Assuming that there is a column in your monday board that will link back to Trello…
- Get items from monday board.
- Get record from Trello. Normally, this would feed to a module to update either Trello or monday.
- Right-click on the module and add an error handler specifying a monday module “Update Column Values of a Specific Item”.
- Add a filter with Error Type = RuntimeError.
- Update a status column to a specific value.
- Add monday automation “when a status changes…”