Thanks for reaching out to the Community, mwagner17.

You can remove any amounts from your Amount field for a line item on purchase orders.

Here's how:
 

1. Open the purchase order you're working with.
2. In your Item details section, find a line item you want to delete the amount for.
3. Click your field in the Amount column. This will be the field which displays the current amount (example: 0.00, or 2.00).
4. Delete all characters from the field until it's empty.
5. Select Save and close.
   
   

I've also included a detailed resource about working with purchase orders whiich may come in handy moving forward: Create & send purchase orders

Please feel welcome to send a reply if there's any additional questions. Have a wonderful Thursday!