Assume if have you A,B,C Custom Objects, once we create the Record in A Object then Automatically B,C record should be created from reference of A a. A relation B b. B relation C

Hmm.. In that case, could you please try APEX action type? You can also try using Future method in the same apex class. Make sure you're passing the correct parameters to apex (either second object or first object).

If it's not possible, you can also try Flows.