Maintaining consistency manually can be a real headache as you scale. But that issue is what I've heard some product information management (PIM) systems are for; they seem to keep everything in sync. I've heard it can be a lifesaver when you're selling across multiple places. This guide lists some of the best ones for e-commerce businesses: https://growthfolks.io/software/best-pim-software-for-ecommerce/. This kind of software basically creates one central source of truth for all your data, meaning you only have to update it in one place to update it everywhere.