Quantity Pulldown / Bulk Ordering Feature

Yes, that's possible as explained on that thread:
www.hikashop.com/en/forum/4-how-to/15254...uantity-ordered.html

Yes, such overrides allow to do that but it's more complex as you need to write PHP code to change the quantity values based on the product where you are.

It's the same as the code of the thread I already gave a link to.
Simply add an if/else based on the product where you are. For example: if you want a specific dropdown for the product with the id 18 :

<?php
function hikashop_quantity_render($html,$i,$max_quantity,$min_quantity){
if(hikashop_getCID('product_id')==18){
return '<select id="hikashop_product_quantity_field_'.$i.'" name="quantity"><option value="25">25</option><option value="50">50</option><option value="75">75</option><option value="100">100</option></select>'.$html;
}else{
return '<select id="hikashop_product_quantity_field_'.$i.'" name="quantity"><option value="50">50</option><option value="100">100</option><option value="200">200</option><option value="500">500</option></select>'.$html;
}
}