April Olson covers Creating a Management Reporter report to import data into Microsoft Forecaster
Creating a Management Reporter report to import data into Microsoft Forecaster – Dynamics Corporate Performance Management – Site Home – MSDN Blogs
Reporting & BIDevelopment & IntegrationInstall, 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.