How do I add a combinator to my style?
You can only add combinators to child selectors. Add a child selector and combinator will appear in the Style tree.
Acquia Cohesion renames to Site Studio from version 6.2. Tell me more.
No, you cannot layout forms with Acquia Cohesion.
The style preview may not be updated because the refresh icon hasn't been toggled to the active state.
You can style tables or forms through the use of base or custom styles.
You don't. You apply a Descendant selector. These use a (Space).
Opacity is set using a decimal where 0 is transparent, 0.5 is 50% and 1 is solid.