There are documents that assist you with Sage 300 ERP Year-End Procedures. They are checklists of tasks to perform for year-end. The documents can be found in Sage 300 ERP by following these steps:

In the newer versions of Sage 300:
Logon to Sage 300 ERP.
From the task ribbon, click Help.
Click Product Documents.
Browse to the version of your product, then select Checklists.
Locate the link to Year-End Procedures.

In earlier versions of Sage 300:
Logon to Sage 300 ERP.
From the menu bar, click Help.
Click Documentation.
Browse the ENG folder
Locate the PDF document with the filename Sage300ERP_Checklist_YearEnd.pdf