There is a new Management Reporter, FRx and Forecaster User Forum Coming.
I’ve heard a lot of complaints from advanced users about a lack of resources for MR so this may help.
Management Reporter, FRx and Forecaster User Forum Coming – Inside Microsoft Dynamics GP
Reporting & BIInstall, Upgrade & Admin
Archived post from 2012. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.