pgAdmin 4 provides simple but powerful dialogs that you can use to design and create database objects. Each dialog contains a series of tabs that you use to describe the object that will be created by the dialog; the SQL tab displays the SQL command that the server will execute when creating the object.
To access a dialog that allows you to create a database object, right-click on the object type in the pgAdmin tree control, and select the *Create* option for that object. For example, to create a new cast, right-click on the *Casts* node, and select *Create Cast...*