Joining two forms using a unique ID

I have two forms:

  1. List of addresses each with a unique ID
  2. A sign-up list where a resident would fill out information and select their property address from a drop-down list

I have created list number 1 using Gravity Forms and it is complete.

I have created list number 2 using Gravity Forms using a couple of drop-down items using the “Populate Choices Dynamically” so that the user can select one of the addresses from list number 1. I have also set the value to the unique ID of form #1 as shown:

From here it is not clear on how to proceed. When I select one of the addresses from form #2, I do not see the unique ID in the values that are saved. I was thinking I would just need to save the unique ID from form #2 and then somehow join the two lists when I need to display one of the entries similar to how one would do this with plain database tables. Am I on the right track in implementing this or is there another way to deal with this when using Gravity Forms?

Since I received no replies to my question, I’ll have to assume that what I am asking cannot be done or no one know how to do it. So, I’ll ask a different question.

I have a list of addresses for a number of properties. When people sign up for an account, I would like to have them choose one of the addresses in my list. I don’t want them to type in their address into a text field because they are not consistent in typing in their own address correctly. How do I go about setting this up?