How do I add top-level and child object records at the same time?
Learn how to add a child record table to the create form for creating a top-level object record. In this video example, we'll use the Contact object with a custom child object defined in Application Composer.
The video shows you how you can add the child records to the create contact form and save them all together.
Note: This video assumes you've already set up the standard experience
for the custom child record using CX Extension Generator.
Here's the video: Adding Top-Level Object Records and Child Records at the Same Time.