You may unpack your box of products to sale them by units. On the device you need to do the following. 

Before you do the unpacking make sure that you have create the end product to bring those unpack units into that one. 

Look for the item then edit it, touch the icon with the double arrows to active Case or Box and Case for sale too

keep in mind that you need to set the inventory on how many boxes you are intially unpacking and save that item. 

Go back to the new box then touch Products contained on this box or case

Next look for the item that is contanied on that box type how many are in it and then Finish > On the item screen touch Save

Go to Main menu > Products

Touch Unpack Boxes

Touch the plus sign 

On the item to be unpacked type the amount of boxes that you are unpacking > Finish

Remarks: Keep in mind that you are unpacking boxes to sale the itmes by units.