Perhaps someone else will be able to provide a full usage example, but in the meantime you could take a look at the various USD classes in the manual : FlexScript Class - USD.Stage (flexsim.com)
Here's an example script that will add the class and path attributes to a usd prim such then when saved and reloaded the USD prim is replaced with the processor:
USD.Stage stage=Model.find("USD Stage1"); USD.Prim mymachineprim=stage.findPrim("/USDmachines/MyMachine"); USD.Attribute classattr=mymachineprim.createAttribute("flexsim:property:Class","string"); classattr.value="Processor"; USD.Attribute pathattr=mymachineprim.createAttribute("flexsim:simObject:path","string"); pathattr.value="/Processor1";
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