It's not possible to put in a "dynamic" destination directory. The user can, however, use the "Paste Special" command to get around this.
- Open the SDL.
- Select some documents and select "Edit -> Copy".
- Switch to a new SDL.
- Select "Edit -> Paste Special" and make sure "Destinations" is unchecked and "Substitute settings from default document" is checked.
The effect is that the document's settings are copied, but the destinations are set to the defaults set by the user.