Auto generate Lot # to thousands of items

Hi there

I am changing our items to be lot tracked and I can see where to set the auto generate options in the item card...but I need to change several items to auto generate. Is there a utility or script I need to run to update 1000s of items?

I looked at the Item Class level...and the tracking option is there...but the auto generate options are not ??

GP 2010

Any suggestions on how to do this?

Tami