自定义开源项目的源代码控制的最佳实践

I have been using an open source Java project and had to make some custom changes for our site. I have downloaded the source code via Subversion, modified two files and built a custom JAR file. Now I need to store these custom changes into OUR Subversion source control system. What is the best way to do this?I have been using an open source Java project a