Only mention of Pl or Ph is show below from cut/paste of manual, seems more like zone/groups than tones.
4.12 VFO Scan and Channel Scan
1. VFO scan: In VFO mode, press microphone key or key to start VFO scan . if the
radio has programm PL1, PH1, ,PL2, PH2, PH2 frequency( in the buttom of channel list), VFO
scan will between PL1-PL2 and PL2-PH2.
2. Channel Scan: In channel mode press microphone key and then press key to start
channel scan. Channel scan setting shall be programmed by PC software
Frank