How can we add more column options on invoice template for Quickbooks: Premier 2018?

There's no way to add more than those you see on the window in your screenshot.

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Edit: Except that you can add custom fields once they are set up on your items list, as IrishNinoJ  points out.

You can add more columns by going to Item Lists, @justanotheruser21. Let me guide you through the process.

Here's how:

1. Go to the Lists menu and select Item List.
2. Double-click any item on the list to open and edit it.
3. Select Custom Fields. Then choose Define Fields.
4. Name your custom field in the Label column.
5. In the Use column, select the checkbox to turn on the custom field.
6. Click OK to save the custom field.

Feel free to check out this article for more details: Create and use custom fields in QuickBooks Desktop.

Furthermore, you can visit this article to learn how to receive and process customer payments for invoices and in-person sales: Take and process payments in QuickBooks Desktop.

I'll keep an eye out for your reply. If you have questions about managing your invoice template or any QuickBooks-related concerns, please don't hesitate to include them in the comments. We're here to assist you 24/7.

If you add the custom list, does it then become another column that you can add in invoice column? 

If you add the custom list, does that become an option in the invoice column or is it a completely separate thing?

Custom field that are configured for Sales Items will be available to add to your invoice tables.

I currently have added more columns to the invoices, but the problem is as you see in the photo, the only available space is the "date" and that only uses a date format when I edit the invoice.