Hi doswalt,
The default 'shipping' unit of measure that appears for OrderEntry order details is the one set for the 'Pricing Unit of Measure', which you indicated is Lb. This is why Lb is the default. If you want Ca to be the default, you need to edit the item and set the Pricing Unit of Measure to that.
But if you don't want to change the Pricing UOM to Ca, then there is no way to set a default unit of measure at the current time. We could either change IC have to add a new field to the item master for 'default shipping unit', or change OE to include the detail screen for the Entry Template (that currently exists for the order header) and set the default shipping UOM there.
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Regards,
Softrak Tech Support