Creating if then statements in Creator

I'm working on a Daily Report in creator and want to create full automation. For example I have a drop down on work types (In office or in field). If an employee is working in the field I want the "in office" fields to zero out for hours worked. I have been able to create rules that if an employee selects "in office" as the work type then the "in field" fields are removed. However, I want the "in field" inputs to automatically go to zero if the "in office" field is chosen.

Thanks in advance.