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Since there are different ways to merge forms into a single one I will mention both of them here:
1. Using our App to "copy->paste" fields from one form to another (merge them)
2. Using the iframe to show the form within your other form
The first one is a great way to permanently copy the fields from one form on another allowing you to copy all fields from 2 different forms and set them all up in the third one.
This is the app in question: Field Manager
The beauty of this approach is that when you decide to edit something in your form, all you need to do is to edit that one form which holds all of the fields.
The downside is that conditions, integrations, emails and similar on your form would need to be recreated on the new form, since you can not transfer them as well.
Now the second way is to use the Iframe Embed Widget.
This is a very quick way to add different forms to another form, but what happens here is that your forms are being children forms.
You will have all of the conditions and email notifications, etc set up as earlier, but each form is there on its own so when you need to update something, you need to find each child form and edit them in order for the parent form to show the difference.
Both ways are great, but depending on what you want to accomplish one might have an advantage over the other.
If you have any questions about either of the two do let us know and we would be happy to assist with them :)