Delivery To Address addition in Tax Invoice

Unable to add Delivery To address along with Bill To address in the Tax Invoice

Delivery addresses are used only on delivery notes. If you want them on sales invoices, you will need to add them as a custom field. The invoice is presumed to go to the billing address.

Where should we add in custom field to reflect the delivery address in the invoice?

By default, custom fields appear after the main data table of the invoice. See

If you want to place it somewhere else, use a custom theme. See