Instead of updating your products, stocks on all your e-commerce sites, let simply Dolibarr synchronize the product stock and product attribuites.
Send Dolibarr products on your e-commerce
And that without using the Opencart back-office, send a single product or productlists to your Opencart sites with a few clics.
A central stock management
Stock and warehouse management, is a typical ERP function, and of course you have such functions in Dolibarr. So use it to optimise your product stocks
Yes, stock variation in Doliabrr can be automatically and in real time synchronised with your Opencart webshops.
Price updates in Dolibarr can be automatically send to your Opencart Webshops