I am doing husband income tax, the system did not asked me if I want to do it husband and wife together....I want to do it together...

[TurboTaxSusan]

The option is at the very beginning of the Interview. If you didn’t choose to prepare your returns together at that point, you will have to start again, if you are using TurboTax Online.

Here is how to add your spouse's tax return to your own: https://turbotax.community.intuit.ca/replies/2647707