First of all thank you very much for the replies posting in this forum, which helped me many times.
my problem is when I export test cases to QC through excel, QC is overwriting the test name if it is already existing in QC under path we mentioned.
Is there any way to restrict QC or to prompt the user by a message?
I don't know that you can stop this behavior using the regular Excel add-in. It is possible to create your own add-in and check for this during export to Quality Center.
Do or do not... there is no try. -Yoda