Can I set up a conditional tag group to reuse in all documents?

Yes create the first preset and configure it. Right click on it and select Duplicate. Just change what is different about that preset. Rinse and repeat.

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Yes, that is what I am saying. 

I will have multiple documents to publish, all of which will use the same set of condition tags, the same glossary, the same heading choices, etc. You're saying that I can create an output present that will contain my standard choices and then be able to duplicate it for each document?  

I think you are saying you will have multiple outputs which will all use the same condition expression. If so simply select that expression in each preset. If there are more things in common, create one preset with what that one requires and then duplicate it. In the duplicate you only need to change what is different.

If that is not what you mean, please clarify.

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See www.grainge.org for free Authoring and RoboHelp Information