TTax does not allow
multiple accounts to be combined into one account (or to split a single account
into multiple accounts).
You will have to manually add the information from one account to the account
you have chosen to retain. Generally it is better to pick the more
complicated account and manually add the information from the other
account.
The IRS does not care whose name appears first. However, once you select
which name is the 'Taxpayer' and which is the 'Spouse' the IRS wants you to
keep the same sequence year after year.
