creo3 config.pro option documentation for: ACIS_EXPORT_UNITS 
acis_export_units
Allows you to select a standard unit of length that Creo
supports for the export of parts and assemblies to the ACIS format, independent of the model units. For example, if the length in the model is defined in inches, you can export the model with length set in millimeters.
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This configuration option is valid only when you set the enable_acis_export_extension
configuration option to yes
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The following standard units of length are supported:
Meters (m)
Millimeters (mm)
Centimeters (cm)
Inches (in)
Feet (ft)
If you do not specify the units, a part or assembly is exported to the ACIS format in the units of the top-level model.