You can add Non-Labour Charges to a Workshop Invoice to charge for values such as sub contract work.
These can be added by raising a Purchase Order, adding a charge manually in the Non-Labour Tab within the Produce Invoice screen or they can be parameter driven from Workshop > Parameters > Non-Labour Charges.
To remove a value, from within the Produce Invoice screen in Workshop > Invoicing > Produce Invoice, select the Non-Labour Tab.
See the line that currently holds the value for the Non-Labour Charge:
Select the line with the charge against it;
In the Charge field, delete the charge and select Accept;
The Value has now been removed.
Please Note: If a charge was previously added and then removed, this will still appear as a line on the invoice but will be for a zero value amount.