"Utilities->Clip" is a tool to extracts those features from an input 3dr file that overlap with an existing 3dr/3dm file or to clip the input 3dr file with specified extent.
You can clip the input file using an existing file, which could be 3dr file or 3dm file.
You can also specify an extent to clip the file.: the Xmin, Ymin need to be set firstly, then you can select setting Xmax, Ymin or the number of rows and the number of columns.