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Thanks for your reply. The properties pallete does have size as a property but it has no drop down list so no way of changing the size of any items, this happens on all specs even out of the box plant3d specs.
the setting for weather things are viewable or editable in the properties box are controlled in the project setup.
in the project properties box, pick: Plant 3D Class Definitions and say: P3d Line Group.
on the right hand side note the settings for nominal size - read only - visible in area view etc
I think this might be the control your after
You can do it your own way,
If its done just how I say!
[Metallica:And Justice For All:1988]