Another secondary profession

I already ascended and now i have an option to have another secondary prof., i am wondering if it will delete all my skilz in my current secondary. it'll be nice if i could still keep my secondary skilz and learn new ones.

It wont actually delete your current secondary skills, but you wont have access to them unless you switch your secondary back to that profession

if you are currently a W/Mo and switch to W/R you will not have access to the Mo skills, but if you decide later to go back to W/Mo all the skills you learned will be back (but you will lose access to all R skills)