nested.css

.parent {
    color: green;
}
.child {
    color: blue;
}

nested.html

<table id="mytable">
    <tbody>
    <tr class="parent" data-level="0">
        <td>Cash and Equivalents</td>
        <td>000,000</td>
        <td>000,000</td>

    </tr>
    <tr class="parent" data-level="1">
        <td>Cash and Equivalents</td>
        <td>000,000</td>
        <td>000,000</td>

    </tr>
    <tr class="child" data-level="2">
        <td>Cash and Equivalents</td>
        <td>000,000</td>
        <td>000,000</td>

    </tr>
    <tr class="child" data-level="2">
        <td>Cash and Equivalents</td>
        <td>000,000</td>
        <td>000,000</td>

    </tr>
    <tr class="child" data-level="2">
        <td>Cash and Equivalents</td>
        <td>000,000</td>
        <td>000,000</td>

    </tr>
    <tr class="parent" data-level="1">
        <td>Cash and Equivalents</td>
        <td>000,000</td>
        <td>000,000</td>

    </tr>

    <tr class="child" data-level="2">
        <td>Cash and Equivalents</td>
        <td>000,000</td>
        <td>000,000</td>

    </tr>
    <tr class="parent" data-level="1">
        <td>Cash and Equivalents</td>
        <td>000,000</td>
        <td>000,000</td>

    </tr>
    <tr class="child" data-level="2">
        <td>Cash and Equivalents</td>
        <td>000,000</td>
        <td>000,000</td>
    </tr>
    <tr class="child" data-level="2">
        <td>Cash and Equivalents</td>
        <td>000,000</td>
        <td>000,000</td>
    </tr>
</tbody>
</table>

nested.js

$(document).ready(function() {

    function getChildren($row) {
        var children = [], level = $row.attr('data-level');
        while($row.next().attr('data-level') > level) {
             children.push($row.next());
             $row = $row.next();
        }            
        return children;
    }        

    $('.parent').on('click', function() {
    
        var children = getChildren($(this));
        $.each(children, function() {
            $(this).toggle();
        })
    });
    
})