On the Source Record page, scroll down until you see Add child_type, where child_type is the type of child object you want to add (for example, Add Address).
Click Add child_type.
The page changes to display the fields associated with that child object type.
Fill in any open fields for the child object.
Click Save child_type.
Repeat the above steps for each child object to add.
Continue to Step 5: Save the Object Profile.