Change the value of a custom field based on the approuver/stage of approbation

Change the value of a custom field based on the approuver/stage of approbation

Hi,

I'm looking for a solution to set a custom field value( in a service catalogue template for change request) based on the stage of approbation the request is currently on. For this template I have 3 stages of approbation for specific moments in the workflow. If I could name the different stages of approval and have it showed to the approvers It would work perfectly but I have found a way to name the stages, they are always named Stage One / Stage Two / Stage Three. So I tried to build a custom field (Droplist) wich contains the values I want to show to the approvers but I'm not able to have it change automatically and dynamically in fonction of the approval stages or the approvers in that curent approval stage with the field and form rules.
EX : If stageOfApproval = "Stage One"  Then  Droplist1 = "Request approval";
            stageOfApproval = "Stage Two"  Then  Droplist1 = "Test approval"
            stageOfApproval = "Stage Three"  Then  Droplist1 = "Final results approval"
      Else  Droplist1 = "Finished Approved"

Can you help me find a workaround to be able to show to the approvers that he is approving the testing phase by example ?

Thank you,

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