How can making a Drop Down List Such as this form

Hello Everybody

I want to making a Drop Down List Containing the main section and the Bottom of each main section subsections of this section as in this picture



And I have tried making this method But did not work with me and This is the code Who wrote

<select name='' id=''>
           <?php
            $get_sec = mysql_query("SELECT * FROM pic_cat");
            while ($row = mysql_fetch_array($get_sec)) {
                if ($row['subcat'] == '0') {
                    $catid = $row['cat_id'];
                    echo "<option value='$row[cat_id]'>$row[cat_name]</option>";
            
                    if ($row['subcat'] = $catid) {
                        echo "<option value='=$row[cat_id]'>$row[cat_name]</option>";
                    }
                }
            }

         // $row['cat_id'] = Main Section ID 
        // $row['subcat'] = Sub Section ID
       // $row[cat_name] = Section Name
           ?>
        </select>

PHP:

I hope I have clarified the problem​

 

Is there an example of this online somewhere that you found?

 

I found it in Wallpapers Script into admin Panel

 

Have you tried using inline CSS in the option tag? You may be able to literally just format the text with CSS but I'm not sure on that.

Also a link may help if you have it

 

Thank You Mr tguillea for trying help me
I have known how to Make them

Thank You Again