I have nearly completed my son Camerons 2016 return and he says he wants to do it himself. I am not sure how i can make sure you disregard all the work i did earlier tod

Assuming Cameron is your dependent, make sure he understands it is important for him to say he can be claimed as a dependent on someone else's tax return when he goes through Personal Info.

This is a User to User Q&A forum, so I can't see any of your work. However, unless you actually E-filed and submitted the return, it won't go through and nothing will happen with it.