The Microsoft Dynamics GP Support and Services blog answers How do you setup a Payroll Garnishment in Microsoft Dynamics GP?
How do you setup a Payroll Garnishment in Microsoft Dynamics GP? – Dynamics GP Support and Services Blog
Payroll & HRMicrosoft & the GP Ecosystem
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.