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<img src="smileys/smiley25.gif" border="0" align="middle" /> There are folders for events. I have quite a number of folders, and I have an event sheet in the top one that includes all the sub sheets so I can easily bulk-import the logic.
If you right-click on "Event sheets," do you get the "Add subfolder" option?
(Just took a quick snapshot of prototype I started a few days ago -- this is what you're looking for, right?)
db.tt/3bX0U084