How to set start and duration of leakage in WaterGEMS?

Dear all,

In WaterGEMS CONNECT Edition Update 1, the orifice size can be changed through the emitter coefficient, but I do not know how to specify the leakage start and duration which is different from the demand pattern.

For example, in the shown figure, I want the leakage to start at some nodes in a network from 7 a.m. to 12 p.m.