Say I have a page with 10 cards, but I only want to schedule 4 of them to go to one user. Any way to schedule just those 4 without creating a sub-page and copies of those same cards?
Not that I'm aware. All pages will include all cards for report scheduler. I guess an alternative would be to create a publication with only the cards you want.
Or set up alerts for that person on all 4 cards,and set them to go out daily, like a "Changes by 0%", type of alert that will always trigger. You should get a single email with all the alerts on a daily basis.