Do I need to indicate my wife's application as a dependent in my own DTV visa application in Vietnam?

My wife and are in Danang Vietnam and we are soon going to apply for the DTV. Here it's all done online.

So my wife is my dependent. and I understand I first need to apply for myself only and get the visa, and only then she can apply, right?

So this my question:

Do I need to specify in my own initial application that my wife is going to apply after me as my dependent, and to already supply them with our marriage certificate and sponsorship letter confirming that I am her indeed her sponsor?

Or all that stuff needs to wait until only after I get my visa and she submits her own application?

Many thanks