First, create a virtual-GPS-List called e.g. "D/T Matrix" and select it.
then go to the tools / mapmatrix page and set the filters.
On the map you can draw a line around all those caches you want to add to the virtualGPS-list.
Add those caches to the list and then change to your virtualGPS.
Now you can export the list as GPX file.
Hope this helps.