1. Close the 941 form. If asked to save changes, select No.
2. Select Maintain, Payroll, Reclassify and Rename Payroll Fields
3. Select the Payroll Field in the Taxes table
   • If you know the tax that is missing from the 941 Schedule B, find that tax field and click in the Category field on that line.
   • If you do not know the tax that is missing from the 941 Schedule B, you will need to do the following steps for each tax that is reported to the 941 form. They are Fed_Income, Medicare, Medicare_ER, Soc_Sec, and Soc_Sec_ER
4. With the tax highlighted in the Taxes table, click the Benefit button located between the two tables.  The tax will now appear in the Benefits table with a category of *Not Assigned.
5. Select Save, then Close. 
6. Select No on the next message
7. Select Maintain, Payroll, then Reclassify and Rename Payroll Fields
8. Select the tax that is now showing in the Benefits table, select the Tax button located between the two tables.  The tax will now appear in the Taxes table. 
9. Change the Category to the appropriate tax name.
10. Select Save, then Close.
11. Select No on the next message
12. Verify the 941 Schedule B is now correct

Solution 2: Semi-Weekly filer

Update the check date. Follow How to change dates on payroll checks.

941 frequently asked questions and troubleshooting
Form 941 fractions of cents amount is unusually large