How can a child custom record be attached to the parent record?
1) Include a custom Subtab, and ensure that a custom List/Record field is enabled on the Subtab.
2) Include a custom Inline HTML field, enable Show in List, and set the Default Value to Record is Parent.
3) Include a custom List/Record field, set List/Record to the parent Record type, and enable that field as Record is Parent.
4) Include a custom List/Record field, set List/Record to the parent Record type, and set Source List to the parent Record Type.
