Hi Mandeep, If I understand you correctly, you want your 'drop-down' to go upwards instead of downwards? This can probably be done with CSS, just give your drop-down a custom class and try adding your style using these examples: (https://codepen.io/ngaller/pen/GpzZXN & https://stackoverflow.com/questions/7814186/drop-down-menu-that-opens-up-upward-with-pure-css)
I'm afraid it's not possible as each browser determines how elements such as dropdowns are rendered.
See also this topic on StackOverflow: https://stackoverflow.com/questions/10887742/how-do-you-stop-a-dropdown-menu-from-going-up