If you originally created a Purchase Order for a certain number of units of a product but you found that you have received only part of that quantity. Now, you want to delete the remaining products so that your Purchase Order can be completely Received. Here's how you do so:
Select the Purchase Order that you have Partially Received.
If you click on the dropdown field marked Received you will be able to see the quantities of the products you have already received.
Next Click on the Edit at the top right hand corner of your page. You will be directed to the Edit Purchase Order Page.
Here you can see that you are still waiting to receive more stock. At the end of the field you will be able to see a symbol for a trash can. Click on it to remove the products you are no longer waiting to receive.
Click 'Save'. The products you selected will be deleted.
Here, the variant Cat Tepee in purple has been deleted.
If you wish to void a purchase order instead, follow the steps here to do so.