Create multiple roles with the access rights that you wish to grant to your user groups.
1. To Create a New Role Navigate to Administration/User Management/Roles and Press the + Add Button on the Main Toolbar.
2. Provide a Unique Name for the Role you are Setting Up.
3. If this is an Administrator Role, then set the Is Administrative checkbox to True. Administrator will automatically have access to all Modules and have the ability to edit the Application Model.
4. Users linked to this role should be able to access the Application Model Editor and set the Can Edit Model Checkbox to true.
Move on to granting Data Access Permissions for the specific role under the Type Permissions Tab.
See Add Type Permission for more information.