Wonder Lister
User guide

How can I add an item to multiple User Managed User Folders?

By default, Wonder Lister allows a Template or a Listing or a Sales (aka an item) to be in one User Managed User Folder only. If you add the same item to a different folder, it will be removed from the previous folder. To override this behavior and allow one item to be in multiple folders at the same time, you will need to change your preferences.
Follow these steps:
Click on the menu option
Tools > Options > Preferences
Click on the tab "User Folders"
Clear the box "Enforce one-item-one-folder policy"
Save your preferences