I am an employee for a large company. One of our vendors gave $ each time I sold their product & it added up to $825. I do not know how to complete in Turbo Tax.

You will need to enter the information in both Form 1099-NEC and Schedule C sections.  You would start from the 1099-NEC section under "1099-MISC and Other Common Income".  You would then follow prompts to tell the program you are filing a Schedule C.  As it creates a Schedule C for you, you will need to go to the Schedule C portion separately to confirm your income amount, add related expenses and complete required information. 

In TurboTax online, here are the steps: 

• Sign into your account, select Pick up where you left off
• From the upper right menu, select Search and type in 1099nec and Enter
• Select the Jump to 1099nec
• Follow prompts to complete the section

Then 

• From the upper right menu, select Search and type in schedule c and Enter
• Select the Jump to schedule c
• Next screen, "Your 2020 work summary" under your self employed business, select Review
• Continue to enter related expenses and other required information

Generally, most taxpayers who receive a Form1099-NEC are considered as self employed by the IRS and required to pay self-employment tax.  You will need to file a Schedule C reporting both income and any related expenses. This will show on line 8 of your Schedule 1 and Form 1040.

Did you actually receive a 1099-NEC?

At first glance, this appears it may be a "spiff" that is NOT subject to Self Employment tax.