Existing List Items allows you to copy list items from any list in your Content Group to another list. These items will act as if they are the same items even if they are in different lists. If you make a change to one list item, the change will occur in all lists that item appears in.
Login to the Jolt Web Portal, go to Content then Lists.
1. Select + New List or edit an existing one.
2. Adding items by selecting +Existing Items.
3. You can select List Items from Active or Inactive Lists.
4. Select the arrow to transfer them to your new list.
5. Select Add when finished.