Traktor Kontrol X1 MK2 - Mapping Deck B and Deck C

hello community,

i have a question after googling for a while. the controller can be adjusted to use decks a/b, c/d and so on, but what i`m missing is the option to assign deck b and c to my controller (i think this is by default)

but why do i want to do that? i have the following setup:

Technics 1210 mk2 | allen&heath xone px5 | Traktor Kontrol x1mk2 | Technics 1210 mk2
(i`d prefer to assign the turntables to a & d and the controller to b & c)

do i have to use the controller editor or does someone have a template to achieve this? how shall i proceed?

1000 times thank you in advance for your advise