Sorry, new user here and trying to work out how to get the aircraft profile right.

Given that the cruise climb is (near enough) constant in FF, IAS and RoC until turbo critical altitude, how do I get the transition point coded?

The profile seems to allow only one IAS or TAS for a profile (fuel flow), yet of course as altitude increases, the IAS decreases and the TAS increases if FF stays constant. I can't seem to find a way to reflect that

TIA

Ben