Wrapping up their year end process posts, the GP team shares Microsoft Dynamics GP Year End Release 2011 – General Ledger Year End Close
Microsoft Dynamics GP Year End Release 2011 – General Ledger Year End Close – Dynamics GP Support and Services Blog
Year-End & 1099General Ledger & Financials
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.