In answer to your first question about entering carryover amounts, if you don't have any you would leave the entry blank. If the program doesn't allow that for some reason, then you would enter $0.
As far as carryovers to next year are concerned, if you use TurboTax again they should be entered automatically by the program. I can't see the original question, so I don't know if or why you would have carryover amounts to next year associated with your business. One possibility is that you report a loss on your business this year as that could result in a qualified business income (QBI) loss carryover to next year.
A passive loss carryover would normally be associated with a passive activity such as a home rental. A normal business in which you materially participate would not normally generate a passive loss. If you have a home office associated with your business, you may have some unallowed home office deductions that would generate a carryover deduction.
Also, you can't deduct home office expenses for a salary job, that would only apply to an office you use for self-employment work.
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