I an missing one W2 form for add'l information. Can I save this now or should I complete out and amend later?

[KarenL2]

It's usually best to save and wait until you have all the information to file.  The reason is if the IRS receives your "incomplete" return, then it will likely delay your refund. They will send you a letter/notice with adjustments and you may have to pay underpayment penalties.