I have a working IHS Kingdom project with ED50 datum. I loaded old 2D seismic lines as supplementary data into this project, and later discovered that those additional lines were delivered in WGS84 datum at that time when they didn’t seem to be in place in my project. How can I convert the XY coordinates of those 2D lines to ED50 datum? By the way, it is not possible to get back to the processing shop to ask them to make this conversion.