If you pay an employee the same wage for multiple positions, you can set a base wage in their profile. This will apply the wage to all their assigned positions unless a base position wage or individual position wage has been set already.
To set a base wage for an employee, go to Dashboard > Employees and click their name in the list to open their profile.
Next, go to the wages tab. There, you can add a base wage for the employee.
Click Save and you will see that rate applied to all positions. In this case, a base wage was already set for the Prep position, so you can see that it overrides the employee's base wage. The base wage would need to be deleted to default to the employee's base wage.