Preprinted forms? You don’t need no stinkin’ preprinted forms.
Microsoft Dynamics GP 2016 R2: Print W2 with Boxes, lines and Labels – Microsoft Dynamics GP Community
Payroll & HRYear-End & 1099Microsoft & the GP EcosystemGP 2016
Archived post from 2017. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.