Reopening closed fiscal periods in Job Cost

Hi,

I'm using Dynamics GP 2010 and was wondering is there a way to reopen closed fiscal periods for job cost. I was able to recreate the fiscal periods using the instructions found here https://mbs2.microsoft.com/Knowledgebase/KBDisplay.aspx?scid=kb;EN-US;871789 for the company   but for job cost it doesn't seem to allow for that. Any suggestions on how I can do this?