Yes there is and I have used it. The desk is obvious as you arrive. Tell them what you need to do. When I did it they took my passport and e-ticket to the CX desk landside to get my boarding pass then brought them both back to me. There was then a transit "Security" with a very minimal amount of theatre to go through. 90 minutes should be OK - I did it on a same plane turnround with CX if I remember correctly (CX can't, or couldn't, do return check-in for MNL at HKG). You don't need to clear immigration, and I don't recall having to pay the airport tax (PHP750).