Let me clear up the confusion for you, @bbatesda.

You won't be able to delete a template that you've used in other transactions. You may consider using other templates for that specific purchase order. You can also create a new template from the Manage Templates window.

1. Go to Vendors and select Vendor Center.
2. Select the vendor.
3. Open the purchase order.
4. Click Manage Templates.
5. Click Copy to create a new template.
6. Click OK.
7. Then, you may customize the new template.
8. Click OK.

Once done, you can email your purchase order to your vendor.

Please let me know if you need further assistance. I'm always available for help. Have an awesome day.