"so the form 944 will work to deduct the expenses and salaries in schedule C?"

Everything about what you posted here is Wrong. Further, this is for using ProSeries software to prepare clients' tax returns.

You really need to find a CPA to help you fix whatever you did in 2020 for all that payroll, and whatever else you need to review with them.

Look at this similar topic:

https://proconnect.intuit.com/community/proconnect-tax-discussions/discussion/re-paying-taxes/01/138...