Code:
/set %channel #chan1,#chan2,#chan3
/set %target #targetchan
/set %trigger trigger word *
; the "*" is needed
; and in the remote section:
on *:TEXT:*:%channel:{
  if ( %trigger !iswm $strip($1-) ) { return }
  /msg %target $nick has said $1- on channel $chan
}


try that