All types of UR points are still combinable.
You can combine TO how many accounts you want however each Card can only ACCEPT from 1 Card that is not in your profile.
(you can do Card A to Card B than Card B to your Card )
It has to be a spouse or partner [chase did not close any account in the past year for combining points from others. correct me if I am wrong]
Transferring to Airlines/Hotels
Sapphire preferred can only have you and 1 additional user linked to your UR account. might reset after a year but not sure
Ink plus/bold can have 6 employees linked to your UR account after the 6th you'll get an error didn't try yet to putpac it might work.