title: Adding multiple collection into a collection
body: <p>I am new to blue prism. </p>
  
  <p>I want to add multiple collections in my collection.
  Business Scenerio:</p>
  
  <p>I have multiple sheets in an excel file. I have converted a sheet data into an collection. So I have multiple collections for that excel. </p>
  
  <p>Now I want to create a Parent collection and add all child collections to it. How can I achieve this in BluePrism.</p>