I am dealing with a multipart polygon shapefile of Canada, where each province is its own polygon. Simply for cartographic purposes I want to display the provincial boundaries as a dashed line but given that shared boundaries are not actually shared (2 lines overlapping) in a multipart polygon I am unable to use a dashed line as it does not line up between the two shapes and is no longer dashed!
My end goal would be to 'merge' those shared boundaries so they appear as a single line rather than two overlapping lines. I have tried dissolving, multipart to singlepart, topology, polygon to polyline and nothing seems to achieve my goal.
Like I said, this is purely for cartographic purposes so the method does not have to be perfect and a MacGyver workflow would suffice. I am running ArcGIS 10.4.1 for Desktop basic lisence.