Payroll Manual Calculation loses multiple Task Codes

SUGGESTED

In BW 2013, When I have to go in and manually calculate a check due to a garnishment, I have a problem if there are multiple task codes.  I don't change the hours or $$ when I do the manual calculation, just look at the taxes and post a deduction for a garnishment. Even though I have entered different task codes it just ends up all in one task code.  Is there any way to keep the different task codes?