Huy137 Unfortunately, it is not possible to copy and paste the attachment key for a slot to another slot using Ctrl+C and Ctrl+V. The issue of being able to copy and paste attachment keys to other slots has been on our roadmap for quite some time:
EsotericSoftware/spine-editor165
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As a workaround, when duplicating a slot, you can choose whether or not to duplicate the keys, so it is possible that the duplicated slot will have the same keys.
