Can incidents be linked to each other?

Yes, you can attach an incident to another incident. The documents panel within the incident is used for this. You can also attach other xTuple objects, such as accounts, contacts, files and items to your incident. For example, if an incident is created for a broken toy, you can attach a previous incident—if it is related. You might also attach a picture of the broken toy, the person you need to contact about it, and the item number of the toy.