Sublime has a file called subl and this what you want the systeme to use in order to run it from cmd
so in windows :
>go to files then to your c drive or wherever sublime is in
>go to programes then sublime
>copy that path from the files bar(mine is : C:Program FilesSublime Text)
>windows logo + x
>systeme
>advanced system parameters
>varibale envi...
>on the system variables search for path varibale and double click it
>click new and paste the sublime path you copied and click ok
>go to your terminal and type subl
if u didn't understand follow this : https://www.youtube.com/watch?v=MlnH8t4S4Qw