The Parallel Lines/Elements function in the Tools menu allows you to copy lines or elements in parallel.
The following image shows a polyline whose copy is shifted outwards at a distance of 10 mm.
Offset Distance
Specify the distance by which you want to copy the lines or elements.
Line / Element List
In the work window, select the line / element to which you want to create a parallel.
You can then specify the offset direction with the mouse. You can check the new line / element in a preview.