Period open process in General Ledger R12

First, We need to add calender to open periods.
Navigation: General Ledger, Vision Operations (USA) --> Setup --> Financials --> Calendars --> Accounting

Query the form with Accounting in the Calendar field as below.

Add/create the periods and quarters like below.

Save all your work.

Continue to Open period in General ledger

Read Also: Period Open Process in Inventory
Read Also: Period Open Process in Payables
Read Also: Period Open Process in Receivables