multiple SSID's

I have a RB433 with and R52hn radio card. Is there a way to setup multiple SSID’s on the wlan1 interface? Thanks for the help.

look up virtual-AP in manual.

That can be added to existing wifi interface and it will be as completely separate AP using same hardware.

What impact on the performance side vAP causes to the wireless throughput, amount of connecting clients etc. ?

it has to send more beacons (for each SSID) so do not over do this.