Billing runs
Bill many clients together and close the run.
A billing run groups the invoices of one billing round, such as a month-end, so you can work through them together.

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Press New Billing Run, name it and choose the invoice date and the clients.
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Open the run to see its invoices, then open each one to check and approve it.

A billing run. -
When every invoice is done, press Close Billing Run.