How to Set Workflow for Sales Order Processing?

I want to set the workflow for sales order Processing.

Don’t change the docstatus to 1 in an intermediate state, since it cannot be changed back to 0. Set it to 1 in the last stage.

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I have Following Requirement.

  1. When Sales Order is Saved status changed Sales Reported.
  2. When Sales Order is Approve status changed Sales Approved.
  3. When Sales Order is Reject status changed Sales Rejected.