Same goods on Amazon, a standalone site, TikTok Shop, but a separate inventory for each platform — that's the typical waste of multi-platform sellers.
First build a shared inventory view
Point each platform's on-sale to the same physical inventory pool. Sell one, all platforms decrement together. The core is real-time system booking, not manual spreadsheets.
Then talk split-warehouse
- Fast-turnover hot items: put in warehouses close to mainstream last-mile, protect speed
- Long-tail slow goods: concentrate in one place, lower rent
- Regional platforms: near-warehouse by main buyer location, lower last-mile
Watch the oversell red line
The shared pool must have "real-time sellable feedback," or one oversell flips all platforms.
Multi-platform isn't multiple inventories, but one pool, many sales channels.
Manage inventory as a shared resource — less warehouse space, and good shipping experience on each platform.