The simplest way of doing this would be to create a blank page with the amount of channels your current controller is using.
Example.. Show Designer 1 + 4 Design Spot 250. that would be 64 dmx channels.. 1-64.
1. So in Compu I would make a blank page with channels 1-64.
2. Connect ShowDesigner to DMX in from Compu.
3. Create a blank scene.
4. Edit new scenes...
5. go to DMX-in tab.
6. Use record function to record scene from other controller.
Look for info in the user manual for that feature.
Best regards,