Vertical offset to a string in profile

I have designed a vertical profile in MXRoad SS3. There are 3 strings profile in display.....1. design string profile 2. existing ground profile 3. existing carriageway center line profile. Now i want to give 100 mm offset to existing carriageway profile string  for overlay in display.

One method is to give vertical offset to existing carriageway string and display it in profile..... is there any other method by which we can directly offset as we do in autocad.

Thanks in advance