Redmine

The idea is that user defines one ticket, but hours spend on it should be tracked on e.g. 2 projects. If I would like to do this now, i would need to duplicate all tickets and track them individually.

Prerequesits:
Ticket has e.g. custom dropdown field - list and selects 2 items from this list (let's say they define 2 different project)

Expected, when user enters hours he/she should be able to select also custom field (e.g. where multiple projects are assigned to one tickets from dropdown list) which should also be available when download of hours is needed.