Will give it a whirl on a couple of these I am taking educated guesses
CB I think is counter battery fire?
CBO COunter Battery Operations
HAA Heavy Anti Air 3.7 inch AA guns
HB Hostile Battery
Apple Pie Counter-Flak targets, called `Apple Pie' in European theatres, were included in major fire plans when air support was incorporated, again usually as concentrations. HF (Harassing Fire) tasks might be included if resources allowed, although only a few guns were needed, but were unusual in smaller fire plans.
SP support
RPG Rounds per gun
Some of these are on the site below which I posted here.
This is the best Biritsh and Commonwealth artillery site I know of.
Artillery British / Commonwealth WW2