Purchase requisition approval setup

Hi ,

I am trying to create a purchase requisition workflow in ax 2012 with multiple approval levels depending on the total amount. My requirement is

  1. if total amount is <$10,000 then only project manager’s approval is needed

  2. if total amount is >$10,000 and <$50,000 then it needs approval from PM and accounting manager/finance

  3. if total amount is >$50,000 then it needs approval from PM, accounting manager/finance and operations manager

I have tried to configure the workflow using ‘purchase requisition expense reviewer’ setup but it only provides project manager field for selection. Please let me know how to configure this workflow.

I appreciate your help. Thank you.