For whatever reason you may have for removing a Process, you can do so by clicking Remove. 

However, you will not be able to remove a Process if the process you are trying to remove is referenced in other processes through the use of a Process Reference field. In order to remove a Process, you must first delete all the references to it. If you try to remove a process that is referenced, you will receive a warning. 

To remove the Location/Sites/Areas process I would have to delete the Locations/Sites/Areas Process Reference field from the Incident Investigation Report process.