primum remote

primum remote                                   # the remote, branch and mode
primum remote set git@github.com:me/board.git
primum remote set git@github.com:me/boards.git --branch my-app
primum remote set https://example.com/board.git --manual
primum remote remove                            # stop syncing; history stays

Option	Effect
--branch NAME	The remote branch; default main. Several projects can share a remote on different branches
--manual	Sync only with primum sync, not after every change

The remote is kept in the project’s history settings, per machine: ssh on one and https on another both work. See history and sync.