I would say you're pretty distracted.
because when one subscribes to the forum it would be good to read what is written at the top of the inventor page.
Maybe it says that it's good to introduce yourself before asking questions and maybe there's also written that before asking certain questions it's good to use the tool "try in this forum", where you can find discussions already made like this:http://www.cad3d.it/forum1/showthread.php?t=8177&highlight=quota+simmetricathat answer your question....