Could u pls tell me can I copy rig from browser to perform?

In performance mode, use the front panel rig navigation buttons to get to the slot you want to load, use the browse knob to find the rig you want and then press the load button.

... plus, if you assign a rig in performance mode to a certain slot, it will actually be a new copy of the initial rig. This works automatically. So, any configuration changes you do to the initial rig or to the new copy, will not affect the other version.

Exactly. Remember what Webdiver said. Sometimes we read complaints because the rigs sound different in browse mode than in performance mode. The simple reason is that changes have occurred...