Hans and Dana,
Your help is highly appreciated.
All set functions work very well. But ExportEntities aGenSelEnts , PDF , "TEST.PDF" produces an additional unwanted view 1 of the model at x=0 y=0 of the drawing.
(for both All display or Window selection method )
Other problem.
The line thickness is very thin and is not related to the width scale in the setting configuration.
I have to try harder. Thank you.