How to add the Online Display Name of Items to Transaction Forms

I wanted to make the Online Display Name of our items show up on transactions forms, so I tried the following:

1. Setup > Customization > Transaction Forms

2. Click Edit beside the name of the custom form that I want to add the Online Display Name to.

3. Click the Printing Fields tab, then click the Columns tab

4. Click the New Field
Here I am expecting to be able to choose from a list of standard fields that I can add to the form. But I am prompted to create a new form that I can name anything I want. I experimented and created a field called “Product Online Display Name” and Saved it. Now this new Transaction Column Field shows up on forms. But that is not what I wanted. I want to delete this Transaction Column Field (which I cannot apparently), and then create the correct kind of field. I simply want the Online Display Name of items in our