- Make a copy of the board outline or route border shape to something that can be made into a polyline (a userlayer or fabrication layer gfx)
(easiest by using Ctrl + double click on the selected shape)
- Shrink the polygon to match trace position. (-1/2 track width when using route border)
- Select the polygon and use the dissolve button (4 red buttons pointing outward on the draw toolbar)
- Select the polylines and change them to tracks with the properties window.
For the other traces you can then use the hug trace command.
Thank you very much Matthias. I am trying this now.