Hello arth61
Thanks for your question.
Please, you can take a look at our Multi-Inventory add-on.
One of its features allows you to create as many inventories as you want, adding multiple in-house locations, restricting sales by region, adding different suppliers, and more.
I’ll leave you here documentation so you can see how it works, and here you can try the demo version to see if it suits your business.
If you're looking for a multi-vendor plugin, unfortunately, with ATUM or any of its plugins, you’ll not achieve this. We also don’t support any of the third-party multivendor plugins.
Best regards,
Iryna