Hey, Leaveit2Lou -- good question! You can definitely do that. In order to order products from Oberlo suppliers the only way to do so is to first import the products to your Shopify Admin, then initiate an order in your Shopify backend as a draft. Once you do that, the order will appear for processing in your Oberlo dashboard and it will get shipped out to your storefront.
With AliExpress products, you can simply order directly through their platform to your door. Either way works, but if you'd like to use our Verified Suppliers, then you'll need to place them through your store. Hope that helps!