HOTAS Cogar RADAR cursor slew

Hi there, for some background, I've bought a HOTAS Cougar off eBay which arrived today, I haven't had time to read the manual, so sorry for my ignorance. My question regards the assignment of the throttle RDR cursor slew key to the TGP slew key in DCS A-10C, is it possible, and if so, how? I have the TMS, DMS and CMS all set up, as well as the rest of the stick and the majority of the throttle, but with the RDR cursor having micro-axes instead of 'buttons', the DCS controls manager does not understand how to program it. If you can guide me on how to do this, that would be very helpful; I'd particularly appreciate if you could make it as basic a possible though as I do know so little at the moment.

Regards,

Charlie