The Administrator has the ability to customise the permissions for each User, based on what they would like them to have access to.
The Web Portal's User setting features enables you to disable permissions for various actions such as modifying jobs, creating invoices or quotes, and more.
To customise these settings in the Web Portal go to Admin > All Users > Select the Edit arrow on the User you would like to customise. In the User's edit view, you can select the permissions you'd like for them, as well as the groups you want them assigned to and the User Types. There are also options to Select or or Select None at the top of each list of permission types.
As well as these options, you can also turn off the Job Value being visible on individual Jobs, with the check box at the bottom of the screen when creating the Job.