The particular figures in AutoCAD Mechanical will be handled as proxy data or block on IJCAD. This is the same case for the data transfer from AutoCAD Mechanical to AutoCAD. (Some figures are possible to edit after exploding it.)
IJCAD Mechanical is already released, which supports the data compatibility with AutoCAD Mechanical. IJCAD Mechanical is designed to be able to exchange the data with AutoCAD Mechanical.