I need to create a registration request validation for multiple types of registrations

I have an app called “Registration Center”.
A place where everyone in my company will request different registrations for validation and upload into an ERP.
I created a table for each registration and a specific one to display the requests.
But I wouldn’t want the validation table to contain all the columns from all the other tables.
Can I display all the data from the other tables in the “Registration Validation” table without having to create a relation for each column in each table?

Do you mean not having to create a lookup column?

Can a registration contain multiple requests?