How can I add serial numbers in sales invoices?

HOW CAN I ADD SERIAL NUMBER IN SALES INVOICE " Multiple Product sales" In Single Invoice

If you mean line item numbers, see https://www.manager.io/guides/10303.

If you mean adding the serial number of a product being sold, use a line item custom field. See https://www.manager.io/guides/10411.

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HOW CAN USE THEME https://www.manager.io/guides/10303

Please stop using all capital letters. That is interpreted as shouting on electronic media. Before you ask a question, look at the Guides. In this case: https://www.manager.io/guides/10366.