I know this thread wasn't for my code but thank you for the feedback on my response.

Hello John,

I am unsure if this is any better but I just attempted to break out some of the functionality into separate functions

const calcOcKeyNum = (numberPresent) => {
  let ocTemp = 0
  if(numberPresent !== null){
    let temp = parseInt(numberPresent[0])
    ocTemp = temp !== null ? temp : -1
  }
  return ocTemp;
}

const sortInputIntoObjects = (_inputData) => {
  let subkey = [];
  // const tempArr = [];
  let ContactObj = {}, OtherContact = {}, Company = {}, Custom = {};
  const addToObject = (obj) => obj[subkey[1]] = _inputData[key];

  for (key in _inputData) {
    subkey = key.split('__');
    switch (subkey[0]) {
      case 'Contact': {
        addToObject(ContactObj);
        break;
      }
      case 'OtherContact': {
        addToObject(OtherContact)

        //ignore, still trying to figure out what to do with extra contacts
        // let ocKeyNum = calcOcKeyNum(subkey[0].match(REGEX_NUMBER))
        // tempArr[ocKeyNum] = OtherContact[subkey[1]];
        break;
      }
      case 'Company': {
        addToObject(Company);
        break;
      }
      default: {
        addToObject(Custom);
      }
    }
  }
};