yeah, from the HTML tab you can just right click the style on the right hand side of the window and click New Rule. It'll assume that you're attempting to write a new rule for the type of element you currently selected, but just tab to that box and you can change it.
Note, when I say style here, I mean style on the HTML tab, not the style tab itself.
Note, when I say style here, I mean style on the HTML tab, not the style tab itself.