KX3 macro for swapping VFOb control when working split.

[OE6FEG / M0FEU]

Hi,
    does anybody have any advice for writing a macro that will allow VFOb to be controlled with the main VFOa tuning dial when operating in split mode. It gets a bit annoying having to continually tune with the small OFS/B knob, and whilst swapping frequencies from A to B works, that too can be a nuisance in certain situations. I have the programmers reference guide and have been looking through it, but I do not recognise the commands that allow you to reassign control of specific parameters (in this case the VFOb TX frequency) to different buttons or encoders (in this case the main VFOa rotary encoder). Any help or advice would be greatly appreciated.
                    73 de OE6FEG / M0FEU
                                                    Matt