To generate alarm you can generate event that raises alarm. To clear event you can generate event that clears the alarm. For example:
1. Generate alarm
if ({v sensState} == {I 3}) evaluates to TRUE, then generate 0xfff00000 event
0xfff00000 event raises 0xfff00000 alarm
2. Clear alarm
if ({v sensState} == {I 1}) evaluates to TRUE, then generate 0xfff00001 event
0xfff00001 event clears 0xfff00000 alarm
Please notice that I have red-colored the alarm Cause Code. Alarm Cause Code is different from Event Type (Code).
In Event Configuration tool you should be able to set the event to clear the alarm by assigning the alarm cause code, in this case 0xfff00000, in the "Clearead Alarms" section.