Hi Alex,
If you are referring to units precision, this is stored in the Units.ini file found in two places
In the installation at C:\Program Files (x86)\Bentley\Plant V8i\Config
And in the project at %ProjectRoot%\%ProjectName%\Config.
Using the project creation method I mentioned in your other post, you could set this in the configuration and all projects created from that configuration would retain that setting. Once it is set in the project, all new models will have that setting. Previously created models must be updated manually.
Hope this helps!
Jesse Wolfe