Purchase Orders, have you found a way to do them in Jobber?

Hello Equipitdental! We agree with our fellow community members and suggest using a custom field for the PO number!

You can set the custom field up on the client, quote, job, or invoice level. You can also make this field transferable, meaning the value will carry over from the original level to the next steps in the workflow. (i.e. quote > job > invoice). 

Custom fields are useful as they will show in your reports. For more information on how this works, check out this help center article.