Capture Json guid value and save in different variable for each iteration

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If I understand you correctly, you want to run the same request multiple times, and grab a unique value and save it to a new variable each time the request is run?

You could do something like this:

let iterationCount = pm.collectionVariables.get('iterationCount');
if(iterationCount) {
  iterationCount = Number(iterationCount);
}
else {
  iterationCount = 1;
}

const jsonData = pm.response.json();
const value = jsonData.value; // this would be whatever your property you want

let values = pm.collectionVariables.get('values');
if(values) {
  values = JSON.parse(values);
}
else {
  values = [];
}

values.push(value);
pm.collectionVariables.set('values', JSON.stringify(values));

iterationCount++;

if(iterationCount <= 5) { // This would be your threshold for how many times to loop
  pm.collectionVariables.set('iterationCount', iterationCount);
  postman.setNextRequest('Name of this request');
} 
else {
  pm.collectionVariables.unset('iterationCount');
}