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I know it can do a mall, but what about a Half.com clone
I know magento can manage one inventory to be used on many sites, but can it allow for users to have their own inventory that is managed on their site, but also be aggregated to one site? Check out the attachment on this post for a diagram of what I am suggesting. Is this possible?
This would require major customization to the theme and membership integration as magento does not currently offer that functionality. If you are not a skilled programmer, you best bet would be to hire a programmer to do it for you.
it would probably take 3-4 weeks for someone skilled.