In order to create a model you must have RPM, Voltage, Current and time data from a dyno run that you can import. You also need enough data points. The MD2 Dyno samples at 50 hz (.02sec) intervals so for a 2 second run you get 100 data points. If you want to look at a data file download one of the motor model .zip files on the website. The dyno data files used to create the models are included. You can open those files using RC3, Excel or any software that can read a text file.
You can manually create a file just make sure you have 20+ data points. The more data points the better.