Can I use a separate account for Itsdeductible for preparing my adult son's return? and how do I go about creating a second account for him?

If you please you can go create a second account for your son. You would just need to log out and create a new account. You are allowed to have the same email address, but it would need to be under a new user name/ user ID. 

If you need to create an Itsdeductible account for your son please use this link below:

itsdeductibleonline.intuit.com/Login.htm

i tried to create a separet account under the log on and it copied all of the info.  hoe do iseparate the accounts