Can I duplicate an existing PO, change the PO number and job information, and save as a NEW PO to reduce the data entry on repeat orders?

I appreciate you for sharing detailed information about your PO concerns, RGF1. 

I'm here to make sure you'll get the help you need on how to copy and edit your purchase order in QuickBooks Online. 

Here's how:

1. Go to the Expenses menu. 
2. Locate the Purchase order you've created.
3. Click More at the bottom and select Copy. 
4. Once done, click Save and close. 

Please see the screenshots below.

I have articles that will provide you steps on how to process a purchase order from an estimate as well as steps on how to track and run purchase order reports in QuickBooks Online:
 

• Create purchase orders in QuickBooks Online
• Copy an estimate to a purchase order

I’m happy to offer assistance again if you have more questions for Quickbooks Online. Post a new thread or reply here and I’ll be there.