To work with very small parts and set the scale as Small Scale, follow the steps:
Go to Tools > Options > Parameters and Measure.
Select Scale settings tab.
The following dialog box appears.
The Geometry Scale dropdown has two options Small Scale and Standard Scale.
Notice, in this mode there are the following limitations
Parts created at this scale can only be opened in a session using the same.
– Parts created using the standard scale cannot be read
– No conversion to another scale is possible. You will need to restart the part design
– Simulations functions are not available
– Manufacturing fuctions are also not available
CATIA Howto support: