Yes, I'm aware that this is a setting in the VM product settings. However, there is not one correct use, but this feature is used in many different ways.
-) Some shops sell boxes and use the "units in box" simply to indicate how many items are actually in the box that is sold (e.g. one shop I know sells golf balls, where the product is a box of 3/6/9 balls, and the units in box is set to 6 to indicate that the product contains actually 6 balls).
-) Some shops sell bottles of wine, where they can put three bottles (of whatever sort) into one box for shipping.
-) Some shops sell items where only identical items can be put into the same box. So two different products will always need two boxes, but several units of the same product might be put into the same box.
In all three cases the "Units in box" setting needs to be handled differently. I'm sure there are several other use-cases of this setting.
Since there is no one correct way to handle this setting, I haven't implemented it yet. As every shop might use it differently, the best approach is to write a custom plugin that implements it in the way your shop uses it.
Can you describe in more detail how you use this setting to calculate the shipping?
If I understand your initial posting correctly, each product has a setting 1, 2, 3 or 4, which indicates how many of them can be put into a box. I.e. a product with "Units in box"=3 means that the articles uses 1/3 box. If you have two different products, each with "Units in box"=2, does this mean that you only need one box to ship both (because each of them needs half a box)?
Thanks,
Reinhold
