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</o:shapelayout></xml><![endif]--></head><body lang=PT-BR link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span lang=EN-US>I am doing all the geometry by programming and using GUI only to see results. Suppose that I create 2 surfaces that intersect each other. I define a physical group “vertical” for surface {1} and “horizontal” for surface {2}. As they intersect each other, I use “Coherence” or Boolean operation to remove duplicate areas. But when I do this I lose the references of original surfaces, because I have now 3 surfaces and not necessary surface “horizontal” is {1}. Actually, I have hundred of surfaces and cannot do it “by hand”.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>In suma: How can define physical groups than use coherence and keep the defined physical groups? <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='mso-fareast-language:PT-BR'>Best Regards,<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='mso-fareast-language:PT-BR'>Leonardo.<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>