Upgrades and Year End planning. Yay!
Microsoft Dynamics GP 2018 and Year-End Update Upgrade Planning – Let’s Get Started! – Microsoft Dynamics GP Community
Year-End & 1099Install, Upgrade & AdminMicrosoft & the GP EcosystemGP 2018
Archived post from 2017. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.