johnjoe Sir,
Thank you for your priceless help,it helped me like anything. I am really thankful to you. I only assigned SOT 343 fixed art work for the ADS custom symbol model to generate the artwork for the ATF54143 ADS model( because ready made layout model was not available for the ATF 54143)." If you flatten your layout and push into the footprint of your transistor, a standard sot343 layout will open. There you see small red lines, these are the pin assignments. Change their numbers, save it as new layout and assign it to your schematic symbol. Finished".. I am confused little, what I have to do . Can you show me graphically , what I have to do for getting correct layout generation. How we open the standard sot343 layout. Please don't mine, can show me graphically. I am sorry.