When you use Turbotax Online version, you can prepare only one tax return per account/payment. If you need to prepare more than one return, then the CD/Download version is the better value. With that package, you get free e-file of 5 Federal tax returns, and you can prepare as many Federal returns as you wish to print and file by mail.
Visit the link below to purchase any of the CD/Download product.
https://turbotax.intuit.com/personal-taxes/cd-download/