This content only applies if you're working in a hub with collaborative editing. Check for this icon
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If you're a hub admin, you can separate a shared part number group into models with unique part numbers. Reasons you might want to do this:
in the upper right of the page.Secondary models in the group are assigned unique part numbers and their histories are reset. The primary model retains the original part number. If there are children of these models, they are unaffected.