Check List in Ticket (simple)

Hello
I want to use the simple tickets so that guests can recorded their requests on ProjeQtOr and I thought I would use the check list. But this is only visible in the "tickets".
I have already customized the display of the simple ticket (cleaning of many fields), but I did not see where and how was called the check list depending on the type of tickets (neither in sqlelement nor in ticketmain .. I had to miss a few things: '()

Thank you in advance for your answer.

Hi,
Thank you for the reply.

I need to do a proof of concept for 1 service first, and I can't buy the module actualy.

I need to do Something like that : (in ticket only)
Profil01 can access type of ticket Ticket01
Profil02 can access type of ticket Ticket02
Operator can see all type
(for that I use resticttype)

Profil01 can see in ticket "fieldPerso01" but not "fieldPerso02"
Profil02 can see in ticket "fieldPerso02" but not "fieldPerso01"
Profil01 & 02 can't see field "criticity", "priority',...
Operator see all

I see in database "extrahidden", "extrareadonly", "extrarequiredfield", and I see in sqlElement.php "private static $_extraHiddenFields = null;"
But when I modify in ../model/custom/ticketMain.php and add " private static $_extraHiddenFields = array (...);", I don't see change.

I hope you can help me to understand.
PS : It's nothing if the module is not compatible with the change I make, because if I have the go, I restart in a prod server (no import)

Thank you and sorry for my English