South Carolina law requires that you register your newly purchased vehicle within 45 days of the purchase date. Use our templates to draft South Carolina bills of sale.How to title or register or locate a branch where to do it in person on the SCDMV's official website. A South Carolina motor vehicle bill of sale is a form used to document the transfer of ownership of a motor vehicle in South Carolina. 1. Identify the Buyer and Seller with their contact information.