Is it possible to remove PIN numbers on the symbols?
Is there a way to change the number of enter PIn by just clicking right and enter a number of pin. for example on logic gates?
No you cannot do this directly, but the example of logic gates is coped with by using multiple parts per package. In one symbol you can specify different sub-parts and then the user can select which one they wish to use when they place it.
In the documentation, look at the "Introduction to Libraries" section and then scroll down to the section named "Multiple Parts Per Package".