Sorry, I didn't respond because I'm pretty sure we had talked on the phone yesterday. If I recall, you're not using the editor, so you select:
Edit Presets
then, select a preset
Turn Local Page on
Then, there will be a new option "Edit Buttons". This works just like the top level "Edit Buttons" screen, but any changes to buttons you make here will only apply to the preset you're currently editing. Buttons that are marked as global will still appear on the local page.