Hilton Reserve and Signature cards...
...can now be merged into your Citi personal login ID with your other Citi personal cards. Call Personal Card Support at 800-347-4934 and if you get Marcello, count yourself very fortunate. He's the best guy there.
Biz cards still cannot and probably never will be mergable into a personal account.
Now I'm down to only two ID's!
Geoff