code in distances as stations

I have a lisp program that uses a 3dpoly to draw a profile of existing ground elevations. Currently, the program only writes in distances as whole numbers (ie:500 or 1600) I would like it to write them as stations along the profile (ie: 0+500  or 1+600) does anyone have a peice of code for doing this?

I run civil3d2012, but most of the rest of the office uses map3d2012

map3d2012 and civil3d2012

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