Thanks NikSharma for prompt reply.Hey,
Yes, spouse can be added into the application any time. Even during or after your OINP application.
You can also add a spouse after the nomination, before/after ITA or AOR.
Whenever you add the spouse your CRS will always be recalculated and having additional 600 pts won't be bothersome to you. Hope this helps.
So just to reconfirm, currently my CRS is 463, if I modify family information now to say 'wife will be accompanying', score will be recalculated to 444. Even then the OINP NOI received will still be valid and I can go ahead and accept the NOI in OINP portal. At no point will this fall of score (from 463 to 444) will be questioned and will not be a matter of concern for OINP as the NOI was already issued.