can you give me any link and tutorial for understanding wieframe and surfacing and gsd?
I have some tutorials in GSD here:
general CATIA V5 here:
no body can make you understand surfacing better than you urself. keep playing with the various options available in catia and u get to know it all much better way. there are a few tutorials available on this site. search for them and if you have any specific requirement of any particular tool you can search it on youtube.