hi everyone ,

i have one question about sub-categories:

if i have some stories in a category let's say "Food" and i want to add some sub-categories to food like -beef -bread -anything else...

what's happends with all these news i already have in Food categories ??
they are lost ?
if i click in Food after change it.. normaly i'm going to see the new submenu of sub-cats non, what about the old news?

thanks for your help