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As I understand it, wGroup and other dynamic built-in groups you can only define new tags in by creating an item and adding the new tag on the item, much like you did with your copies or the Spanner item. As long as you have an item with the tag on it, you can extend that tag to the existing items. You can't dynamically extend though AFAIK (I haven't figured out a method even using .1st files, but ShadowChemosh may have some more info.)
If you wanted to hide the Spanner item from dropdown choices you can add the Helper.Helper and Helper.NoSelect tags to the Spanner Item (checkboxes in editor are: Helper Object? and Don't Allow Selection?)
You would then have an item that player's can't see or select but it would have the wGroup.wgHammer that you wanted to share with the other three items.
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