We tell helos to either report at/approaching the aerodrome boundary in a given direction, having joined the CTR via visual reference point, or join into a particular circuit leg for an approach to the runway. We have two helo. schools and approx 6 other helos based, 4 of which are with an AOC operator, for info. Departing helos are air taxied to a runway holding point usually or occasionally depart from the parallel taxiway.Hope that helps a little.