We have two different brands as work-spaces in our Marketo Instance, now we want the unsubscribe mechanism to be independent of each other. I have already included custom html link in footer with "?mkt_unsubscribe=1&mkt_tok=" but have not removed default code under admin section. My question is if I remove the default code will it affect other brand also? If yes, do they have to include custom html code also and create some campaign for the same? Or there is any other better way to do the same?