Prevent specific users from viewing your sale prices and/or cost prices by creating a profile and applying it to them.
- Click on the Cog
- Select 'Manage User Accounts'
- Click on 'Manage User Roles'
- Click on 'Create New Role'
- Enter a name for the role
- At the bottom of the screen, untick the following two, depending on what access you want to give
- Go back to the user list
- Edit the user you want to restrict access for
- Change their role to the name of the role you have just created:
- Save the changes
Note that if you grant the user access to the invoices section they will be able to see any prices in that module.