Hi
Please take a look at
How to create LPAR using HMC Rest APIhttps://www.ibm.com/mysupport/s/question/0D50z00006LL22nCAD/how-to-create-lpar-using-hmc-rest-api
It suggests "Alternatively, you can also get the existing LPAR specification from GET method and use the response as payload to create new partition by changing the specification as required."
I hope this helps.
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Regards Chris
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