Bundle Options for inventory

I sell a lot of over 1400 products and my customers like to be able to buy in bulk and save.  Why can't Shipstation allow for bundling.  Other services do you generally start with a lead SKU with variations of that SKU so that a customer can order 1 of that item or 3 or more of that item at a cheaper rate while maintaining stock leaves of the original SKU.  Does anyone else want this service as well