Lists and smart lists can be shared and referenced across workspaces for easy reuse from the Database.
Person partition rules apply (smart lists and static lists in a workspace only show people who are both members of the list and members of the current workspace).
Go to the Database.
Right-click a campaign folder. Select New Folder.
Drag and drop a list or smart list you want to share into the new folder.
Right-click New Folder and select Share Folder.
Choose a Workspace to share with. Select Save.
Awesome! This list will now be available in both workspaces.