adding hulls to cores?

Hey Guys, you got a ton of good looking ships uploaded in the library. I'm wondering if you can add those ships as core, ie, when creating new designs, those ships hulls are there, to add weapons, etc to. Cause they kinda clutter up my user ship list.

Is there any way to do this, or do I simply just have to upgrade those hulls in my userlist? I tried looking through the forums, but there's waaayyy too much information, and I don't see what I'm looking for.

Thanks!

BBD