AME approval customization

Hi Team,

We have got a new requirement in AME (for AP invoice Approval process).

There are 3 employees with Same Band.

EMP-A,EMP-B,EMP-C. BAND:10 Approval Limit $1000.

EMP-C IS the supervisor for  EMP-A,EMP-B.

condition :1 If the invoice amount is <1000 and approves are  EMP-A or ,EMP-B then they can approve and approval notification will be completed then and there only.

condition 2: If the invoice amount is 1000 and approves are  EMP-A or ,EMP-B then they can approve and after from EMP-A or ,EMP-B notification have to be active status and has to be flown to EMP-C as EMP-C is supervisor to EMP-A,EMP-B.