title: Null out list of columns' row values based on another column
body: <p>I have an example table below:</p>
  <div class="s-table-container">
  <table class="s-table">
  <thead>
  <tr>
  <th>first_name</th>
  <th>last_name</th>
  <th>country</th>
  <th>2019</th>
  <th>2020</th>
  <th>2021</th>
  <th>2022</th>
  </tr>
  </thead>
  <tbody>
  <tr>
  <td>John</td>
  <td>Doe</td>
  <td>UK</td>
  <td>100</td>
  <td>200</td>
  <td>null</td>
  <td>null</td>
  </tr>
  <tr>
  <td>John</td>
  <td>Doe</td>
  <td>France</td>
  <td>150</td>
  <td>50</td>
  <td>null</td>
  <td>100</td>
  </tr>
  <tr>
  <td>Mike</td>
  <td>Lin</td>
  <td>US</td>
  <td>null</td>
  <td>200</td>
  <td>300</td>
  <td>400</td>
  </tr>
  <tr>
  <td>Anna</td>
  <td>How</td>
  <td>Germany</td>
  <td>null</td>
  <td>null</td>
  <td>50</td>
  <td>90</td>
  </tr>
  <tr>
  <td>Anna</td>
  <td>How</td>
  <td>UK</td>
  <td>90</td>
  <td>200</td>
  <td>800</td>
  <td>null</td>
  </tr>
  </tbody>
  </table>
  </div>
  <p>How can I null out the 2019 onward columns to null if the country is UK? The year columns will eventually grow, so I'm trying to adapt for that. The first three columns will not change.</p>
  <p>Output:</p>
  <div class="s-table-container">
  <table class="s-table">
  <thead>
  <tr>
  <th>first_name</th>
  <th>last_name</th>
  <th>country</th>
  <th>2019</th>
  <th>2020</th>
  <th>2021</th>
  <th>2022</th>
  </tr>
  </thead>
  <tbody>
  <tr>
  <td>John</td>
  <td>Doe</td>
  <td>UK</td>
  <td>null</td>
  <td>null</td>
  <td>null</td>
  <td>null</td>
  </tr>
  <tr>
  <td>John</td>
  <td>Doe</td>
  <td>France</td>
  <td>150</td>
  <td>50</td>
  <td>null</td>
  <td>100</td>
  </tr>
  <tr>
  <td>Mike</td>
  <td>Lin</td>
  <td>US</td>
  <td>null</td>
  <td>200</td>
  <td>300</td>
  <td>400</td>
  </tr>
  <tr>
  <td>Anna</td>
  <td>How</td>
  <td>Germany</td>
  <td>null</td>
  <td>null</td>
  <td>50</td>
  <td>90</td>
  </tr>
  <tr>
  <td>Anna</td>
  <td>How</td>
  <td>UK</td>
  <td>null</td>
  <td>null</td>
  <td>null</td>
  <td>null</td>
  </tr>
  </tbody>
  </table>
  </div>
  <p>I was thinking of having <code>List.RemoveItems()</code> to get a list of the year columns. I'm trying to go with <code>each if</code> when doing the conditionals and then using <code>Replacer.ReplaceValue</code> where the value is <code>&gt;0</code> and replace with <code>null</code>, but not sure how to apply this to the list of columns.</p>