problems with connecting my subs to my end stage

Hello dear members I once have a question, since I have dealt with the topic “ohm impedance” for a long time now. Unfortunately only after I got my amp and my bassbox, because I did not know the impedance such a role play. now unfortunately I did not understand everything and please help me so that I can connect my system correctly. to info : AMP : Infinity kappa one 1x 500 watt rms at 4 ohm 1x 800 watt rms at 2 ohm box : infinity reference 1220DE (2 built-in) e bassboxes in a housing) nenimpedance 2×4 ohm efficiency 97 db load capacity (rms) 600 wat now to the individual questions. Question 1 if I switch the sub now in parallel I logically get 2 ohm. should I now distribute the cables to my 2 end stages channels brimmed: the two + cables on end stages channel 1 and the two cables on end stages channel 2 ? or rather leave one channel standing and everything on one channel ? question 2 : my bassbox with 2 bassassis gives a b alasability of 600 wat. I couldn’t find anywhere, unfortunately, whether this is described on a chassis or on both of them together so if I connect the pinned one if it’s 1200 watts or together 600 so that each chassis has only 300. vll have experience with it what is right and wrong here? then I know now that the box should never have watts like the amp can give (clipping).ALSO HOW THE BEST APPROACH?