There Is a small problem with "Hotel style" gravies. Searching about the Web turns up multiple sources of the gravies with different experts claiming anything between 4 and 10 different flavours. Trying to find any recipes that then use these gravies is a different matter. The same experts who show how to make gravies inevitably go on to show all of their dishes made from scratch, not using the gravies.
This is a common occurances and anything directly related to using the gravies is simply missing.
Yesterday, I did make an absolutely wonderful Shahi Chicken Korma from a hotel white base gravy. I also used it with some Makhani gravy to make Malai Kofta sauce which was delicious as well. I made the koftas the day before. Both were my own creations after close examination and extrapolation from selected standard recipes. The Korma I made was easily my best ever by leaps and bounds and nothing like BIR. A lot of work but we'll worth it. My recipe is available if anyone is interested. I remembered to take notes while I still recalled my ingredients and steps.
I have found 1 place that advises on the combinations of gravies to obtain different "dishes" but it's a bit "Indian" in nature and I'm a little sceptical, but the site does give the same dishes from scratch as well which it says are not as good but quicker. There may be something worth investigation here.
Edit, it has just dawned on me that the Aussie IR lessons of Masala Mark from 2010 are in fact very much 'hotel style'. It's a shame his recipe set was never finished. I've made his 3 gravies a few times and they are now well worth another visit.