Under Automation, Select Buttons, Create Card Button.
Give the Button a name.
Use the very first Action in the list of options and change "move" to "copy".
Select "the top" or "the bottom" of the list.
Then choose the list you want to copy the card to.
You can copy the card to a different board.
You can also link the two cards together
Once you've made all your selections, click the plus sign to add the action and then save your button.
You should see the button in the right hand list of card options
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