Filter based on Form it was created at

Hi
On my portal i have 2 different forms for my customers, creating different types of tickets. 
Now i would love to set up a filter for my agents to only see tickets that are created in a specific form. 
If you view the details of a ticket, there is the information about the os, the form,… but i cant find a way to use this as a filter. 

Reason i need this:
I need to have asome kind of identification on my tickets that 

1. are unique based on what kind ot ticket they are
2. are not changeable by anyone after creation

if there is another way help would be appreciated, thanks

Christian