Weights are set in Capital Library within the Extra tab of a component in the field Weight.
There are no "Units of Measure" assigned. Each company will determine what the units are (e.g. grams or ounces) and then simply enter a number.
When you run a report, you then take the number reported to mean XXX grams or XXX ounces.
Default reports are found under the Tools menu. You can modify those available.
If you are running version 2014.1 then you can use the Report Builder to create your own report.
Details about modifying default reports or creating your own can be found within the help system or the user guides found within the following directory:
C:\MentorGraphics\Capital\docs\pdfdocs
Regards,
Pat