Downloading file to another system

Hello,

There is a class in one of the systems that my company has, and now we would like to move it to another system line by line. However, the problem is that the class has like 13 long methods and I really don't want to physically copy and paste every single attributes, parameters, exceptions and codes one by one in SE24. Is there a more convinient way of doing that? Thanks a lot!

Regards,

Anyi