Creating a new tab
 

Is there a way to create a new tab in the editor? For example, two of the base classes in Complete Psionics use mantles, which are similar to Cleric Domains. However, if I make a new Cleric Domain, it adds it to the list of domains for clerics. Is there a way to make a Psionic Mantle tab that would do the same thing as the Cleric Domain but for psionic classes?

Try the Custom Ability tab - Cleric Domains are actually a subset of custom abilities.

Ok, I think I have something that will work. Is there a way to make a custom ability available to multiple classes, or would I need to make a separate ability for each class? The reason I ask is that there are two classes (Ardent and Divine Mind) that use the mantles. Thanks.

When defining the second class, tell it that it should "Allow Class Abilities..." from the first class, and assign all the custom abilities to the first class.