Set up a multi variable User Picker field when 2 conditions are met

[Chris Delgado]

I have a task for a new project, and I am trying to wrap my head around what would be the best practice for setting up the following:

- A user will create a ticket in this project and select a combination of 2 things, for example:

Shop - Shop        -----> Ticket gest assigned to User1

Warehouse - Shop ---> Ticket gets assigned to User 2

etc, etc.

The groups will be something like this:

Product

Cost

Procurement

LOP

Supply

VP

Cap

Logical

Faculty

  User 1         User 1        User 1              User 1  User 1     User 2  User 1    User 1    User 1

  User 2         User 1        User 2              User 1  User 2     User 1   User 1   User 2    User 2

I went ahead and created custom fields (user picker - multi user) for all the groups above, but now I want to see what is the best approach to present those in the form I created.  

Essentially we want these fields not to be editable or even show up in the form when a user creates a ticket, and then according to their selection it will show up which user is assigned to it (User 1, User2,etc).

Thank you much,