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No functionality exists to look at a desired cable, and find its associated spool. Please create a function ProCableSpoolGet() to fulfill this functionality.
Note: There is a workaround for this if desired:
Use ProCableParametersCollect to get an array of parameters for the desired cable, then find the cabling parameter "SPOOL" by name. You should then be able to build a ProSpool object using that value of that parameter and the model it was found in (usually the assembly owning the harness part).