Threshold triggers on PRTG libraries

Hi all, We are monitoring bandwidth on all our WAN links and we defined sensor factory to have a percentage of usage. On these % sensor we defined triggers based on threshold to get alerted (using notification triggers) in case of overload. Our WAN links have different speed and we defined the threshold on the sensor factory to have everywhere the same trigger (e.g. > 80% usage) for traffic in and for traffic out (both are listed in the same sensor) Triggers are defined on all sensor factory independently and it's not practical when we need to adapt the threshold because we need to parse every sensors. That's why I would like to use libraries to centralize the triggers. My problem is on the threshold trigger in the library I only have "Primary channel" (= traffic in only) or "Total" (traffic in + traffic out). Is there a way to have channels for traffic in and traffic out on threshold trigger? I noticed this is something possible on speed trigger. Thanks in advance for your help. Michaël