Zoho Books/invoice gives you the option to show or hide line items that have a zero value. It would be helpful to show zero value line items that are manually added while hiding zero value line items "Created From Projects".

Use Case:

In the service industry invoices include custom descriptions that can vary by the person doing the billing. We therefor have to change the value of items automatically added to zero (in order to show them as billed) and then add them manually. Becuase we do not want to show the item twice we have selected the option to hide zero value line items. However, it would be nice to show manually line items that have zero value and are used for descriptive purposes.