Charles Allen explains Using Sparklines & Data Bars to Visualize Data in SQL Server Reporting Services Reports
Using Sparklines & Data Bars to Visualize Data in SQL Server Reporting Services Reports | Dynamics GP Insights
Reporting & BISQL & DataInstall, Upgrade & Admin
Archived post from 2013. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.