The Job Costing add-on module lets you invoice jobs to customers. A job card is more powerful than an invoice, because it gives you more options when invoicing. Inventory items can be inputted into jobs, the same way as normal invoices. Service items can also be inputted to invoice labour items.
Negative lines can be invoiced thus removing the need for a credit note. One job card can be invoiced multiple number of times, making it very helpful when a job spans over a long period of time and the customer wants to pay in stages.
Job Templates can be created where the workload is reduced considerably. Popular templates of jobs that are performed can be created once and then copied every time.