Invoice Approval for Freight Lines

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Hi Team,

We have below requirement in out project - 

If the Invoice is a 3 Way or 4 Way matched then it should get Auto-Approved but if any Freight or Miscellaneous lines get added manually on the Invoice then it should go for approval of the Invoice line requester added on that Freight line.

Could you please suggest some approach to achieve the same.

Also if there any document to setup Invoice line level approval, please share.

Appreciate your inputs.!

Thanks !