1. In Accounts Payable, choose Banks from the Navigation Bar
2. Choose the correct bank from the Bank Account drop down menu
3. Under General Tasks, select Edit Account Details 
4. Choose the Payments tab, highlight the appropriate type of check and click MICR Line in the upper right-hand corner
5. Increase maximum check number length > click OK
6. Save and Close the bank account.
7. Process checks as you normally would

-OR-

1. In Accounts Payable, choose Banks from the Navigation Bar
2. Choose the correct bank from the Bank Account drop down menu
3. Under General Tasks, select Edit Account Details 
4. Choose the Payments tab, highlight the appropriate type of check and enter the correct starting check number
5. Save and Close the bank account.
6. Process checks as you normally would