Go into the preset edit menu and then copy the preset. After the preset is copied, hold down the Paste button for 2 seconds. The device will paste the copied preset to all banks for the current active preset.

On the Editor, you can copy the preset you want to paste and then triple click the Paste button to paste it to all banks. For example, if you want to copy Preset A and paste it to all banks, just load Preset A into the editor, click on Copy to copy Preset A, and then triple-click on Paste to paste Preset A to all banks.