Cant explode sections

New user, doing tutorials. I cant explode this wire frame into two parts. It probably just behavior but can someone tell me what im doing wrong please?
RC_Controller.3dm (519.1 KB)

its a subD surface, these can not be exploded. if you would explain what tutorial you are doing or what your are trying to achieve somebody might be able to help you.

you can use the command split and select the edges but i doubt that this is what you are really after.