Allowance calculation on Wages Overtime

Hi there,

My employees are all on different hourly rates and are entitled to different all-purpose allowances which need to be reported separately: 

eg:

Base Rate = $42per hour (Gross)

Industry = $1.69 (Allowance - all purpose)

Tools = $1.04 (Allowance -Tools)

Leading Hand = $1.74 (Allowance - task)

Which is fine but then calculating their overtime = their Base + allowances x 1.5 (or x2.0) 

Which there is no option to do in MYOB Business (it's base x 0.000 or per hour). Unless I create new pay items for each employee for each type of overtime as a 'per hour' amount which feels messy. 

Is there a better way to do this? Also if I create all new pay items for the employees their payslips looks horrendous because all their existing YTD items stay on there. 

Thanks,

Tess.