To open PADS Logic designs you use File - Import - PADS or File Import - PADS Logic depending on which version of DxDesigner you are using. Before doing so you should do a little reading up to understand the process.
Thanks for the response. Could you please suggest some material to get started. To be quite honest I haven't found Mentors documentation to be helpful at all to this point. I have version xDx Designer and Pads-Layout vx.1.1.