Yes. By clicking the Transfer icon at the bottom of any screen within the mobile app, you can register a Comchek draft issued by the same company that issued your Comdata OnRoad card in an amount up to your available balance, less any appropriate fees.
You will need the draft number located at the top of the paper Comchek you are looking to register to complete the process.  Click on the Transfer icon at the bottom of any screen within the mobile app, then follow the step-by-step instructions for the Create Comchek option.