The following explains how to add the dimensions (height, width and depth) and also the weight to a stock item. This can be used when deciding which courier to use, how much to charge and when picking and packing.
Usage
Open the stock item if the item is not already open.
Make sure you are in the Properties tab.
Click on the Edit button if not already in edit mode.
Set the Height
Set the Width.
Set the Depth.
The system will then calculate the volume.
Set the Weight.
Click on the Save Stock Item button when finished making changes.
Notes
You can use whatever metric units you wish, but you must be consistent throughout the system.