I found a way to do it, but I don't remember how.
Are you using the Custom Groups tab, or doing it through an arc?
There are tabs for local arcs, published arcs, custom creatures, and custom groups.
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I am surprised I havent found it yet, if it is there; if its not there, it needs to be at the top of the priority list.
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You may have to empty the custom group of all creatures. You can either delete them (custom enemies), remove them (original enemies), or change the group they're associated with (custom enemies).
Once the custom group is empty it'll vanish.
Deleting characters, if that's how you want to do it, is done through mycreattions->mycharactes, not from within the editor for your story.
I found a way to do it within the editor.
You have to use the "My Creations" tab and there is a delete option when you click on a Custom Group.
Problem solved, thanks for your replies. Obviously I was blind, rather than dumb. 
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I am surprised I havent found it yet, if it is there; if its not there, it needs to be at the top of the priority list.
[/ QUOTE ]
You have to empty the custom group of all creatures. You can either delete them (custom enemies), remove them (original enemies), or change the group they're associated with (custom enemies).
Once the custom group is empty it'll vanish.
Deleting characters, if that's how you want to do it, is done through mycreattions->mycharactes, not from within the editor for your story.
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When I say MA Editor, I mean the entire interface, not just the Story Creation interface. 
Post deleted by Void_X