Selling on multiple marketplaces without a synced catalog means the same product exists as separate, independently managed listings — a stock update on Amazon doesn't touch Flipkart or Meesho unless someone updates it manually. We set up catalog and inventory sync using tools like ChannelEngine, Sellercloud, or marketplace-native bulk upload templates depending on your SKU count and platform mix, so a single inventory change reflects everywhere.
This also covers SKU mapping and standardization across platforms that use different identifiers and category structures, and variation/parent-child listing setup (size, color) so a single product with multiple options doesn't fragment into unrelated standalone listings on any given marketplace.