Tracking inventory when selling using multiple accounts

Sellers with high selling volumes or those who sell on multiple accounts, how do you track your inventory in your warehouses or prep centers?

I have been using google sheets till now but looking for a better alternative like a dashboard where team can add product images, purchase orders, invoices, etc.

I use a prep centre which has a live dashboard of all inventory, inbound and outbound.

Many high-volume sellers move beyond Google Sheets once they need centralized visibility and team collaboration, and they usually adopt an inventory management or prep center software that integrates with Amazon.

Popular options include SoStocked, RestockPro, and InventoryLab, which give you dashboards for stock levels, POs, supplier tracking, and cost management. For broader operations that also cover eBay, Shopify, or Walmart, platforms like Skubana, Linnworks, and TradeGecko (now QuickBooks Commerce) provide multi-channel inventory control and allow you to attach product images, invoices, and notes. Some prep centers also use their own client portals where you can upload POs and view images of received products, which saves extra software costs.

The right choice depends on whether you only need FBA-focused replenishment or a full ERP-style system, but almost all of these are easier to scale than spreadsheets and can be shared across your team with role-based permissions.

Customizing a Google Sheet is the best.

Doesn’t Google Sheets get messy with all the purchase and sale orders? I purchase items from a supplier and then allocate the items from that purchase order to different accounts. How do you add the invoices to the sheet? By uploading them to Drive and adding the link?