I have a Custom T-Code with type-Transaction with parameters(Parameter Transaction), How can I have to copy this to new program?

Sap Gurus,

I have a Custom T-Code with type-Transaction with parameters(Parameter Transaction).

Now my requirement is to copy the existing program & i need to do some changes, So How can I have to copy this to new program?

What is the purpose of Transaction with parameters(Parameter Transaction).?

Below are the screen shots:

Thanks

Shabareesh