title: Find and concat string based on 2 conditions
body: <p><a href="https://i.stack.imgur.com/Gqmi1.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Gqmi1.png" alt="enter image description here"></a></p>
  
  <p>In col B, I want to find all "Add:" strings from C:D range for each Source(col A). I do not want to fetch any other value. I have tried using vlookups and index/match but I am not able to get the array of strings and concat them using a formula. I do not want to use VBA.</p>