Helpdesk users can now combine multiple tickets into one new or existing ticket. This keeps customer history, followers, descriptions, and tags together while archiving the older duplicate tickets, making support work cleaner and easier to track.

Task - https://www.odoo.com/web?#id=33622&view_type=form&model=project.task&action=333&active_id=131&menu_id=4720
pad - https://pad.odoo.com/p/r.cc0b4cdf39270fe6ae2d56b02fe8b3f8