Question: I have transaction data which includes a trade date. I want to be able to match the trade date of the transaction with the matching time period. 

I have a table with 5 different time periods like so:

Period 1: 1/1/2000 - 3/31/2000

Period 2: 4/4/2001 - 6/6/2001

Period 3: 10/10/2002 - 12/31/2002

etc.

I want to be able to match the dates from the transaction data with their matching period for further calculation purposes. 

The only solution I could thing of was nested if formulas but those are always ugly and depending on how many different periods I have not usable.

Thanks for the help!

Answer: 
```
<html lang="en">
<head>
  <!-- Required meta tags -->
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <!-- Latest compiled and minified CSS -->
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" integrity="sha384-rwoIResjU2yc3z8GV/NPeZWAv56rSmLldC3R/AZzGRnGxQQKnKkoFVhFQhNUwEyJ" crossorigin="anonymous">
  <!-- jQuery first, then Tether, then Bootstrap JS. -->
  <script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>
</head>
<body>
  <h1>Welcome home</h1>
  <div class="dropdown show">
    <a class="btn btn-secondary dropdown-toggle" href="https://example.com" id="dropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
      Dropdown link
    </a>

    <div class="dropdown-menu" aria-labelledby="dropdownMenuLink">
      <a class="dropdown-item" href="#">Action</a>
      <a class="dropdown-item" href="#">Another action</a>
      <a class="dropdown-item" href="#">Something else here</a>
    </div>
  </div>
</body>
</html>

```

Hey! So, generally it's best to do all your file imports in the `<head>` component of your file. Also, you had some issues with how you were calling the .css files, so the code didn't like that. Here's your code working!

Let me know if you have any other questions.
```html
<html>
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <!-- Latest compiled and minified CSS -->
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
  </head>
  <body>
<h1>Welcome home</h1>
 <div class="dropdown">
  <button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown">Dropdown Link
    <span class="caret"></span></button>
 <ul class="dropdown-menu">
      <li><a href="#">Action</a></li>
      <li><a href="#">Another action</a></li>
      <li><a href="#">Something else here</a></li>
    </ul>
    </div>
</body>
</html>
```

Try this out, it might get you closer to what you need. From the Bootstrap W3 tutorial they have the menu structure formatted a little bit differently than your implementation. It looks like you are very close though! <https://www.w3schools.com/bootstrap/bootstrap_dropdowns.asp>