Install "Option Types v2" addon ( [url removed, login to view] ) on a clean OScommerce 2.3.1.
Note: This addon is OSC 2.2 based, thus some code modification will be required to make it compatible with OSC 2.3.1
Please do not bid if you don't have experience with oscommerce and incapable to finish this job quickly!
4 freelancers are bidding on average $48 for this job
I will be able to do this within 24 hours. I do require $5 USD before starting for safety precautions. I am experienced in eCommerce software and this will be a really easy job for me.