Within V6 Upsell Manager you could set default quantities for certain upsell manager links. For example if you had an alarm system product & wanted to setup a upsell link to a battery & needed two batteries you could set a default quantity. It looks like the products with upsell manager default quantities from V6 databases still pull through these quantities within the Prospect 365 web UI but you can't set it for any new upsell manager links as it's not included in the interface.