Global Shopping Cart with subsites different payments?

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Hi, my site has each store taking their own payments. I understand that all products can't be purchased at once. Each store has to paid for separately.

Is that a setting where all the products for different shops can all be put in one shopping cart display then when they do to check out. It will tell them they need to purchase the product separately?

For example at http://www.etsy.com when I pick two items for different shop they are still in the same shopping cart. See screen shot:

Please advice?

Kimberly