Karen,
Business Portal does provide a "connection" to Great Plains 2013. Here's a brief list of functionality: query data from within the system, provide business intelligence (charts and kpi's), enter requisitions, enter project timesheets and expense reports, enter timecards, modify personal data (address, W4, education, etc.), enter sales orders. This is just a brief list but hopefully gives you an idea of what can be done with Business Portal.
Thanks
Rob