If employees do more than one type of work, can I assign their payrolls to separate classifications?

In some cases, yes. Typically, if employees are not engaged in construction work, they will be classified in the highest-rated classification for the work they perform. When performing construction work, wages may be divided into the appropriate classifications, provided the division is reflected in the original payroll records, in dollar amounts. 

If wage divisions aren’t properly documented, employees’ wages will be classified in the highest-rated classification for the work they perform.