I'd like to link 2 already existing cases in SalesForce. According to "Help & Training" I should have a "Parent case" field visible when I edit a case but I don't. Is that a standard feature of SalesForce or should I create a custom field?
Check the field accessibility of the ParentCase field under Setup > Customize > Cases > Fields. Click on the Parent Case field name and make sure it is visible for your Profiles. Then, just add it to the page layout and you'll be all set.
