Enhance the certified payroll system to allow administrators to assign hours worked by a single employee to multiple job classifications within the same work period or day. For instance, if Employee A works 8 hours, the system should allow the admin to allocate 4 hours to 'Electrician' (including any applicable premium) and 4 hours to a secondary classification like 'Foreman'. This capability is crucial for accurate wage analysis and certified payroll reporting when employees perform duties under different classifications.