When you submit an invoice, you have to add a product or service, how can we delete current ones.

Hello there, Kaitlin.

Currently, deleting items that appears in the invoice description list is unavailable. Please refer to the screenshot below to confirm if this is what you referring to:

On the other hand, if you're looking to remove an information entered under the Description section, simply click the Trash icon to clear the content.

Please know that screenshots provided above may be in the US version, but the functionality works the same for the  Australian region. 

Feel free to to let me know if you have additional questions or if you're referring to something else. We're always right here to help you.