To link a case to a parent case, perform the following steps:
1. Navigate to Customization > Lists, Records, & Fields > CRM Fields > New.
2. On the Custom CRM Fields page, set the following:
- Label = Type a name for the custom CRM field
- Type = List/Record
- List/Record= Case
- Applies To tab = Case
3. Click Save.
4. Navigate to Lists > Support > Cases > New.
5. Locate the custom field to see a dropdown list where an existing case can be selected. The selected case from the custom field becomes a hyperlink once the case is saved.
Note: Enhancement 74024 has been filed to have the ability to have a parent child or sub case for cases.