Convert Model Lines to Detail Lines

Great tip from the Revit User Group - Inland Empire via BIM Manager:

Switching Model lines to Detail lines and back. Model lines show up everywhere -
Detail lines only show in the View. The workaround is that anything you paste
from the clipboard takes on the attributes of the Mode you are pasting into.

1. Draw some Model Lines.
2. Cut the lines to the clipboard.
3. If you need detail lines start a new Filled Region. (or a floor - to got from detail
   lines to model lines)
4. Paste the clipboard into the sketch - this converts the model lines into detail lines.
5. Select the lines again and copy them back into the clipboard.
6. Quit the region
7. Paste the lines back into the model