It depends on how your business (selling products online) is classified.

If you are just a sole proprietor or a single-member LLC, then you can use Schedule C to report all your business income and expenses.  This you would be able to report along with your Form W2 job all within the same TurboTax Self Employed Online program.  Your business income in this scenario gets reported on your personal Form 1040 along with all your other income.

But, if your business is structured as something else like C corp, multi-member LLC, S corp or partnership, then you would need to use two TurboTax programs.  One for the business return (TurboTax Business - sold as a desktop software only) and then one of the personal TurboTax products to report your Form W2 and your share of the business activity.  In this scenario, you need to report the business separately on its own return and then account for your share on your personal return.