Linking datatypes, but not manually

Need help Database
1

https://www.youtube.com/watch?v=4txlG9nwr1E&ab_channel=Bubble.

I have two datatypes, Car and User, how do I link a specific car to the user automatically through workflows. The video shows how to do it manually, but I would like to automate the process when a new car is created.

2

Create one, then when you create the other one, just set the related field value to be the results of the previous step