That's pretty open ended. If you mean how to implement an HCCI model in GTP, assuming your copy is licensed, you can probably expect a certain amount of tech support from Gamma Technologies. I assume you already have your own HCCI IP, and aren't seeking a ground up tutorial on HCCI itself.
"Schiefgehen will, was schiefgehen kann" - das Murphygesetz
Well, you're probably not going to get anything that divulges ready-to-go commercial technology, because that is what everybody is still working on intently, behind closed doors.
I'd recommend searching SAE.org for publications on the subject. But beware, most items will be quite esoteric and not constituted to give a beginner's introduction.
If you're looking for free material, try searching NREL.gov
These papers will be high level for the most part, I'm guessing, and deal with status updates and achievements rather than detailed methods.
"Schiefgehen will, was schiefgehen kann" - das Murphygesetz
Can anyone tell me how can I add chemkin formatted text file in GT-Power?
Does anybody has details guideline on adding chemical reaction in GT-power for HCCI combustion?
Thanks