Click the ‘Billing’ tab on the left navigation
Click the ‘Products’ tab
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Tip: Products come with default prices, but you can adjust the price when creating an invoice—no need to make duplicate products at different price points.
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Click ‘New Product’ to add a new item to the Products list
Give the product a name and default price
Check the Sales Tax box if the item includes sales tax
Add a product description (this will appear in the invoice email's details table)
Click ‘Save’
(Sample of Invoice Email)