What is the best way to restrict specific users from changing the Priority Level?

[Tankem Williams]

When working on a project, certain users need to be restricted from manually changing the default priority level. How can this be accomplished without affecting the Priority Scheme shared by multiple projects? NOTE This change must affect ONLY the target project.

[André Felipe Rodrigues Lopes]

Hi @Tankem Williams 
If it is only for one project, you can edit the permissions and create a specific group where only those who can edit the priorities will be in this group
To do this you must go to:
1- Project Settings
2- Permissions
3- Edit Permission
4 -Edit Permission
And then you must add your new group to this edit permission
I hope this helps.