Calculating my work hours minus lunch break and then adding forweekly total
I'm having trouble creating a time worksheet. I want to subtract my start time from my end time, determine if I have worked longer than 4 hours (company automatically takes 30 mins for a lunch break off total if you work more than 4 hours), and then calculate total house worked. I'm having a problem with the lunch break portion of the calculation. I need a formula that will work. What can I do??