You can easily copy Parts, Items, or Blocks between Episodes from the same Project, using the 6 dots menu of your Part, Item, or Block (or via the keyboard shortcut, more information in How to manage content in an Episode using keyboard shortcuts).
When opening the menu of your Part, Item, or Block, click on the option 'Copy', and you will see a notification at the bottom left of your screen, confirming that your Part, Item, or Block has been copied.
Go back to your Project's overview and open another Episode. Place your cursor in the Title field of a Part, Item, or Block after which you want to copy your content. Use the keyboard shortcut CMD+V / Ctrl+V to paste your content.
When you copy and paste a Part, Item, or Block into another Episode, the content of the columns, timings, and media will be copied along with it.