If some services imply internal costs you can assign these expenses to services in the Back Office application to see and edit service expenses in the mobile app.
Required Subscription: Service Expenses
Note Service expenses cannot be added to services with the Percentage, Labor, Parts, and Bundle Fee price types.
On the Company tab, click Services, and then on the Services page click Edit next to the appropriate service.
In the Service dialog box, click the Internal Expenses link.
Tip You can also point to the Select button in the Action column next to the appropriate service, and then click Expenses.
On the Expenses for service page, click Add on the toolbar.
In the Service Expenses dialog box, enter the appropriate settings, and then click OK.
Note Service expenses do not affect service amount...
...however, they can be shown in some reports.