I may be wrong in this because I'm now at creating morphs myself but it looks like "create morph" creates a blank morph slot for you to morph a figure in. "Spawn morph" creates a morph based on the current shape. So if you make a unique character using a merchant resource kit and spun dials, you can use spawn morph to merge them all into one morph. Of course, check the readme to make sure that's okay.

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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