Centralized inventory stock control system - fane footwear

I need a centralized shoe stock inventory stock system that can record stock levels and be accessed but multiple users to check and update stock in real time. as each website sells the shoes, the pool of stock from the inventory centralized system is updated to avoid selling out of stock products. I need a centralized shoe stock inventory stock system that can record stock levels and be accessed but multiple users to check and update stock in real time. as each website sells the shoes, the pool of stock from the inventory centralized system is updated to avoid selling out of stock products. visit my website and others that sell my stock, It's important to do so to understand my true requirement What do I as fane footwear website and the iconic need to do ? We all running different systems, can they all be linked back to the master automatically? I need to see how it works and make sure it suits my exact requirement. It needs to be simply, timeless and automatically updated when the third Makes a sale in real ftime What about automatic update - as iconic sells, the reall time stock updates the system and all connected parties Stock is updated. No need for human input If iconic uses one platform and young republic uses another..they each make a sale. This automatically updates their individual systems. Will this the automatically update the master system. Which will update all my stock and any other third parties connected to it. Remember none of these people have stock. They have access to one big stock pile and feed off it. You take 1 out of it, that 1 has to come out of all of them in real time. Not action required, it's automatic All sites are using different systems Check out the sites and you can determine Iconic Young republic Old scholar Archfashion Fanefootwear Emallfashion Downthatlittlelane They sell my products on thier sites .. They don't hold stock, i do. They sale a shoe let me know and i ship it out. They need to be up to date with stock same as me and the other sites to make sure it doesn't sell out. We all sell from separate websites but it's from the same pool of stock, no one has their own stock, they sell mine which I hold and ship out. So therefore everyone needs to know in real time what quantity of each item is available or sold out