Is there an easy way to mark time sheets as invoiced?

Let me provide you with some information about marking time sheets as invoiced, afford.

If you're working in Quickbooks Online (QBO), you'll have to manually mark them to each individual sheet and don't have the option to do it in bulk. Once done, add the billable time to your invoice. 

However, if you're using QuickBooks Time, you can just mark and approve all timesheets so you can mark them as invoiced. To do so, follow the steps outlined below:

1. On the Timesheets screen, select  More, then Approve time.
2. Select Approve All.

To give you more details about the process, check out this article for your reference: Manage Timesheets In QuickBooks Workforce (formerly QuickBooks Time mobile app).

Furthermore, QuickBooks provides various reports that you can use to cater to your business needs. You can filter them to show the specific information you need. Check this out for more details: Customize Reports In QuickBooks Online.

Please let me know if you're referring to something else or if you still have questions when marking time sheets as invoiced. The Community is always here to help you all the time. Have a great day to you!