Am I understanding that sheet 1 has the overall start and finish time, and sheet two has more detailed information, such as the duration of any breaks taken, etc.?
It sounds like you might be able to get what you are looking for with the SUMIF formula. The arguments are (range to meet the if criteria, if criteria, range to sum). The formula would look something like this...
=SUMIF(Worksheet2 incident ID column, =specific incident ID cell from worksheet1, Worksheet2 timelapse between in and out column)
Depending on how your spreadsheet is set up, it will get you the amount of time that was spent either working or not working. If you can't add a column that finds the time lapse time out-time in) for logistical reasons, change the last argument to the "time out" column then in the same formula, subtract off the identical formula with the third argument referring to the "in" column.
If this doesn't make sense, let me know. If you provide columns that the data sits in, I can make the formula more specific.
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