PO approval 2 or 3 step Work flow based on values

Hi  Experts ,

I am working on  PO Approval using workflow.

1. I have scenario such that when PO creates based on amount it triggers workflow mail to outlook for approval PO 1st level.

2. First level approves it should go 2nd level which is last step if amount less than 100K, If total amount greater than 100K add another step 3rd for next level approval and send mail to outlook for approval.

Every time for approval need to send mail to outlook for approving PO.

when I try to us WS20000075 but getting not trigger outlook mail. can you please update how to achieve.

Can you please suggest.. step by step workflow activation and outlook email in workflow possible please.

Thanks and Regards,

Hari