Can you record a voice and add that voice to a character like using writing to speech technique?
Yes, you can record your voice as Voice Annotations. There is an entire guide available for this procedure. You can use the online support page to find out more about this operation.
Support page: http://docs.toonboom.com/help/storyboard-pro/Content/SBP/User_Guide/012_Supervision/002_H1_Voice_Annotations_SBP.html
Additionally, use the results on the Google Search to learn how to use the program as well.