You can drag and drop them from Explorer. It will import each one. They will be imported as separate objects. To my knowledge, there's no way you can get them to import as a single object if that's what you're looking for. You will either have to combine them in a modeler first or import them all into Poser and then export them all at once which will create one obj that you can then import as one item.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

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I use Poser 13 and win 10