I have a survey data for contours. I have got the instruction that I can bring it to state plane by adding easting and northing offsets and dividing by a scale factor. I am stuck. I have tried all the features available in ARCGIS 10.1 under projection and transformation but could not find anything to work it out. I tried calculate geometry but it will give a point file and still cannot bring my data to state plane to match with my other data sets.. My data is contours lines. Any help will be greatly appreciated.