If there is only one technician per invoice you could use the sales rep field. If you need to be able to specify a technician for each line then, if you don't do job costing, you could set up each tech as a job and use the Job ID field. Aside from just including the serial number in the description field, I'm not sure how you could track that. There are add-ons for service companies that will track all of that information and more. They're a significant investment but they do a lot too.
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