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You input the DXP schematic netlist to DXP PCB. Place the components, then export a Specctra .DSN file. The .DSN contains the physical coordinates of the components, and the netlist information.
Route the board in Specctra, then save the result as a Specctra .RTE file. With the DXP PCB file open, import the .RTE file (File>Import menu). The .RTE file contains all the route information from Specctra.
That is all there is to it. You will need to clean up the incomplete routes, and make sure the hole sizes for vias and pads are correct once the file is back into DXP PCB.