Job Costing (Invoice Costing)

In the absence of job costing functionality within standard SBO I am forced to do a u2018work aroundu2019 to debit my mobile engineers costs to invoices. The hours spent on a job vary from 2 to 3 hours to weeks at a time.

I do this by adding each engineer as an item master c/w his estimated hourly cost and then add each hour he spends on a job (or in this case an invoice).

If the time is chargeable then I can set the selling price but if the job/invoice is a fixed price then I add the labour hrs/item hrs as a hidden line.

Has anyone got any better ideas? Either a simple 'add on' or a better u2018work aroundu2019