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I'm not sure I totally understand your question, Dlomshek....
No, you can not explode or convert a multi-body CATPart into a multi-part CATProduct. If this is your situation, you will have to Copy and PasteSpecial each PartBody into a new CATPart. Or use PowerCopy if your parts include Geometric Set geometry.
But if you have added several PartBodies into a single PartBody, you can disassemble the solid by deleteing all the Adds.
(if I missunderstood your question, please reply and include a image of your Spec Tree)