Whenever you change the number of jobs you are clocked into, the program automatically clocks you out of the original one(s) and reclocks you back in with the new setting for # Jobs worked.  So if you clock inwo work order 123-1 at 8:00 and then clock into work order 125-1 at 9:30, he first 90 minutes was devoted completely to 123-1 but starting at 9:30 it clocks out of 123-1 and then clocks into 123-1 and 125-1 simultaneously with # Jobs Worked = 2