Your “Next Step” button needs to run multiple actions. These actions should start with “Update fields in row” from Object Y. The values passed should be from Object X, which you can send using the following merge syntax: {{$Model.ObjectXModelName.data.0.FieldName}} This merge syntax allows you to get data from any model and pass it into the model that is currently bound to the component.
Then you can use the action “Navigate to step” and get to your next place.
Hopefully this gives you what you need.
