Hi Nicolas,
In case if new bulletin is released and it supersedes old bulletin that was previously distributed to assigned computers, it will be required to create new SWU policy(via Patch Management) containing new released bulletin and assign it to computers again.
Default resource target for SWU policies may be defined in Windows Patch Remediation Settings, as soon as it is defined there, it will be applied to every newly created SWU policy.
Thanks,
Roman