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I have tried 2 methods:
1.Componenet - Restructure。
2.Select Part,Right click,move to new assmbly
However, I did not find the corresponding API for this functionality in PROTOOLKIT.
Take a look at ProAsmcompPackageMove()
Or I think it is possible to achieve by "hand". Assemble a component to new assy and delete it from the old one, using separated API functions.