Hi, just adding some info.
As mentioned by several experts above, this requires customization.
However, you can disable Default Item Quantity on the Sales & Receivables page, let users to manually fill in the quantity each time.
Here is a simple example in BC:
Settings for “Quantity” and “Qty. to Ship” in Sales Order – Default Quantity to Ship and Default Item Quantity
https://yzhums.com/10094/
Hope this helps as well.
Thanks.
ZHU
