How to combine responses from multiple forms.

I am not sure I understood your question correctly. Could you please explain more about the issue that you are facing so that we can assist you accordingly?

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Sorry that posted before I was ready. Can you delete that question?
I want to run a disease registry. Basically I want to survey the same set
of rare disease patients with multiple forms. So for a group of say 50
patients, I want to send out Form 1 now, then Form 2 after 3 months, Form 3
after 6 months...
I want to be able to link all their responses by some sort of ID, maybe
name or email.
How can I do this with jotform?
...

You could create this workflow:

1) You could create an autoresponder on Form 1.

2) Prepopulated with basic information from Form 1 the link of Form 2, so the user avoids filling it again: https://www.jotform.com/help/351-How-to-Automatically-Pass-Form-Data-to-Another-Form

3) Put that prepopulated link of Form 2 in the Autoresponder of Form 1, and use the "Send Emails Later" function if you want to send it at a later time:

https://www.jotform.com/help/535-Utilizing-the-Send-Emails-Later-Function-of-the-Autoresponder-Emails

If you want to do the same for Form 3, repeat the steps:

1) Create an Autoresponder on Form 2.

2) Prepopulate the link of Form 3 with the information from Form 2.

3) Put that prepopulated link of Form 3 in the Autoresponder of Form 2, and enable the "Send Emails Later" function if you want to send it at a later time.

Now, if you want to combine all the responses from the 3 forms, you can use the Combine Submissions app: https://apps.jotform.com/app/combine_submissions

Let us know if you have more questions.