dynamically populate gravity form

Is user submitting Form A and it immediately redirects them to Form B or would the user be accessing Form B sometime in the future? Because the implementation for these 2 scenarios would be completely different.

This makes things much more complicated. Because you need some way for Form B to know that the user has already filled out a form to know if it should dynamically populate some form field values. The only way you could probably do something like this is requiring them to be logged in and then doing it based on their WordPress user ID.

It is possible to do this, but it's much more complicated and not something that can be explained quickly. You would have to write custom code to handle this and implement a way for the user to be recognized, then query existing data and dynamically populate the fields.

The first scenario where Form A passes the user to Form B and pre-populates data immediately is much easier to implement without any custom code via the URL redirect to redirect to the 2nd form and pass data via the query string.

This is certainly possible. But it's not something Gravity Forms does out of the box. You would have to use custom code to handle dynamically populating fields, etc.

With the user logged in that will make things easier because their user id is stored with the entry data. So you could query the entry data for Form A based on the user id and then populate fields in Form B from entry data from Form A.

So it is doable, but it would have to be done as a customization and it's difficult to try and explain something like this in detail in a support forum post. As it's a customization you'd have to write the code to accomplish what you want to do or hire a developer to do so and go over the workflow and then implement the customization.

Here are some developers you can try contacting if you need assistance with this customization:

Ounce of Talent
http://www.ounceoftalent.com

Raquel Kohler
raquelaraujokohler@gmail.com

WebDevStudios
http://www.webdevstudios.com

Scott Kingsley Clark
http://scottkclark.com

Out of those Raquel will probably have the best availability as she typically takes on smaller projects.

There is a larger list of developers with Gravity Forms experience here (although I can't guarantee they all know what they are doing):

http://wpcandy.com/pros/experienced/with-gravity-forms