I have about 200 site entries in HM running, which are today all using the same action profile. Some of these sites will now needed an extended action profile. Is their any way to add 2 action profiles, or create for the special sites and new action profile with the new action and a call to the global action profile ?
No, each test has link only to one action profile. If some of your tests need new actions, you can copy existing action profile, add new actions into new profile, select list of tests, and change profile using Test Properties dialog.