How can I put new courts without replacing old one

I downloaded the NBA finals court of boston and lakers. How can I put the court without replacing the old court?
Can somebody help me?

first, make a backup copy of your court..
then put your currently downloaded finals court.

If you copy something to the sgsm folder without over-writing an older file, you can just remove those files and it will go back to normal.
If you do overwrite a file, just be sure to back it up first, so you can revert to it later if you'd like.

(And if you do accedentaly overwrite an original game file without backing it up first, that file can always be found on the game's DVD disc)