Firstly, If both your models are setup the same way - that is the rudder and sailwinch operate the same, then you don't really need to do anything else. The Transmitter will talk to whichever Receiver is switched on, or in fact to both if both are switched on
You bind the Receiver to the Transmitter, not to the model. Once bound, then it stays bound unless you bind it to a different Transmitter.
If you do need to set the servo reverse for one or more channels, then this is the procedure.
To change model in FlySky (Turnigy) i6 Tx
Press OK to bring up the Menu
Press OK again to Enter the set up
Press OK again to select ‘Model Select’
The last model you programmed is Model 1
Press the ‘UP’ button to move to Model 2
Now set this up as you did for Model 1
NOTE NOTE NOTE to save the settings use the Cancel button to exit.- I know not very intuitive
I do have a Turnigy Manual for this set, but its not very clear and written for aircraft and Helis. The Model Programming sequence is not spelt out
Barrie