Tags that have been designated as Updateable in the review screen in the Add Tags and Choices screen can have new choices added within the document review window.

To add a new tag in the document review window, you may click on the tag label to add a choice to the bottom.

You may also right-click on the tag choice where you would like add a new value. You can now select the location where the new choice should be placed within the tag.
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Should the ordering of the choices need to be changed, this can be handled in the Project Admin > Tags area.
Note
The ability to add a tag choice during review will not be available if tag was edited to add the Updatable in review screen attribute after the tag has been added to a tagging panel.
In order for a user to be able to add choices they must also have the 'Create Tags During Review' Role permission.