- Go to the Content section, and select the items you wish to copy
- In the multiple selection view, press Copy items

- The data for these items is now in the global clipboard
- Go to the layer where you want to paste the choices
- (the browser will ask if you want to read the clipboard, choose yes)
- A Paste button should now be present in the choices’ list:

- Press Paste to add the copied choices.
NB: If you copy/pasted choices from an other website, you will need to fix the images.