More fields are being made available to workflow in GP 2018. This can significantly improve options for branching and controlling workflows. More at:
#GP2018 Feature of the Day: New Workflow Fields – Microsoft Dynamics GP Community
#GP2018 Feature of the Day: New Workflow Fields – Microsoft Dynamics GP Community
Install, Upgrade & AdminTips & Hidden FeaturesMicrosoft & 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.