i have 8 + years or more experience with Prestashop and with web development in general (PHP & MySQL, Ajax, MySql). create new product field in back office on product or customer edit page (informations tab). Of course you will be able to fill field with own value and this value will be stored in database.
I can help you with any issue, request in Prestashop related: installation, configuration, hosting, fixes and customization.
Other services in Prestashop:
Install and Configure Prestashop Theme
Setup and Configure Prestashop Modules.
Customize Existing Theme.
Install Prestashop theme (by example from LeoTheme)