Workflow delegation Approval

As far as I know, they were 2 ways to delegate workflow approval beside using workflow structure,

1. using workflow history:
   1. Open Module that use workflow, for example : Sales Order / Purchase Order
   2. Look for Workflow details, and click “Reassign” button 
   3. pick the user to delegate
2. using user info delegation
   1. Open System Administration –> Common –> Users –> Users
   2. Choose the user Approval, Click Option (in setup)
   3. Pick Delegation Tab
   4. Add User for Delegate

-RF-