Is it possible to copy and paste a Button indicator from one chart to another?

Yes. Right-click on a button, and choose either Cut or Copy from the popup menu. Both Cut and Copy will copy the button setup to the clipboard. Cut has the additional affect of removing the button from the pane in which it presently resides. Then go to another chart window or to another pane in the same chart window, right-click in the pane and choose "Paste".