SolidCNC can import IGES , DXF or STL files. There is also some modelling functionality for making points , lines , arcs , splines and surfaces where you can create geometric entities. You may give menu command File -> Open or press toolbar button
You can import IGES , DXF or STL files into the open document , you can load many files in one document. The geometries in the file will be loaded into active document. You will use the following toolbar commands for basic file operations: