You should be able to use dashed lines on partlevel:
-Precice drawning mode (ICD)
-Have or create a layer called Dashed and set linetype to...Dashed on that layer, in the layer creation dialog.
-RMB the drawing view, Edit View curves.
-Filter on PARTS on left pane.
-Select the parts of choise and move them to the layer with dashed lines.
Now some parts are dashed.
Can be used for color also. Attached thumbnail(s)