[bxs02205]

I'm a relatively new user to project and am in the process of setting up a project schedule. Under Format>Text Styles there is a list of different text formats that can be used when tasks are placed on the schedule. My question is how do you create a "Critical Task", an "External Task", a "Highlighted Task", et cetera? I've dug everywhere I can think to dig and am yet to find an answer. All help would be greatly appreciated.