This requirement cannot be tracked in a group. The regulation reads:
"(a) If a certificate holder conducting supplemental operations schedules a pilot to fly more than eight hours during any 24 consecutive hours, it shall give him an intervening rest period at or before the end of eight scheduled hours of flight duty. This rest period must be at least twice the number of hours flown since the preceding rest period, but not less than eight hours. The certificate holder conducting supplemental operations shall relieve that pilot of all duty with it during that rest period."
Since the rest requirement is variable depending on flight time, it cannot be made into a group. However, these relationships can be easily seen using the Time Loupe feature on the Plan tab.