Okay. So you have two option.
1. You can use SWPM for system copy and when it asked for restore you can restore the database and continue with installation.
2. If you have already installed the system simply do the database restore.
Please refer this thread below. It has all the details. Also refer the Db2 system copy guide.
https://scn.sap.com/thread/3346221
Regards,
Subhash