Just a subtle point here, Cmd 76xx isn't actually a forward, it is a digit translation. With a forward, the original number is preserved so that (for example) if the call ends up at a voicemail port, it is processed according to the original number. With digit translation, the original number is discarded and the call is then processed as if it came in originally for the new number.
If you only want a forward, set the number up as a virtual in Cmd 11 and then forward the number using Cmd E6XX.