Hi @chench53 and thanks for your query. If would be useful if you could kindly detail exactly which Tobii hardware and SDK you are currently using that we may best answer your question.
If you are using the Tobii Core SDK, Stream Engine API or Unity SDK then all calibration data is handled directly by the installed Tobii Software and cannot be manipulated directly in the various SDK’s.
You will have greater flexibility in this regard with the Tobii Pro SDK but this requires either a Tobii Pro tracker or the purchase of a special analytical licence to use in conjunction with the consumer level of eye tracker such as the 4C.
With additional information, hopefully we can try to find a solution for your needs. Best Wishes.