title: Separate column values ​after underscores and create new column
body: <p>I am using rstudio, I have this column as you can see from the photo that has values ​​divided by underscores, I would like to make a new column containing only the values ​​that are after the underscore, what formula should I use?</p>
  <p><a href="https://i.stack.imgur.com/YiF0Y.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/YiF0Y.jpg" alt="enter image description here" /></a></p>