Stamps may be moved between documents by dragging them out of the Stamps tab of the Document Inspector and dropping them into the new document's view pane. If the document receiving the stamp already has a stamp of the same name, the drag will be ignored. If the stamp refers to user attributes not present in the new document, actions involving those attributes will have no effect.
Stamps may also be dragged from the inspector list to the Finder, where they become files with the extension .tbxstamp. Dragging a .tbxstamp to a new Tinderbox document's view pane will add that stamp to the document, provided that a stamp does not already have that name.