If you add the name of a Project Manager to a job, this name will appear below the name, the service and the PO number of the job in the invoice.
If all the jobs in the invoice have the same Project Manager, their name will appear only once at the top of the invoice. You can also deactivate this option by unselecting the corresponding option under Settings > Document templates.
You can also choose to display the name of the Project Manager in a separate column in your documents by selecting the corresponding option under Settings > Document templates.