
When you add a note to a parent request, you can choose whether to display the note in the linked requests. Edits that you make to the parent request's note will not be reflected in the linked requests.
When you add a resolution to a parent request, you can choose to display the resolution in the linked requests. This resolution will override the existing resolutions of the linked requests. The edits you make to the parent request's resolution will be reflected in the linked requests.
You cannot display the linked request's note or resolution in the parent request.
You can link requests of different templates and different sites. If you're associated with only the parent request's site and not the linked request's site, you cannot perform operations on the linked request.
If you link a parent request (A) to a new parent request (B), then all the requests linked to A will be linked to B.
You can set up the reference request to be closed only after the linked requests are closed. Go to Admin > Automation > Closure Rules > Request Closure Rules > Mandatory fields for closing requests and select All child requests should be closed.
Linked requests will always remain to be independent requests with their own SLAs, Business Rules, etc.
You can link a request to only one parent request at a given time.