How to store the AccountID of a user in a field based on selection of name in a different dropdown

Question

When our form is first loaded we store the current users name in the "username" field.
I have a “VPApprover” drop down field which is doing a look-up to a secondary list where we have two columns, Approver Name and Department. The Name column is a person column and I currently have the “username” displayed in the view
When a user is creating a new request they need to select a VP Approver
What I want to do is when the user selects an Approver,  store the Approvers “username” aka "AccountID" from the secondary list in the vpusername field on the form. Then on future editing of the form, I’ll compare the “username” field to the
“vpusername” field and if they are the same display an “Approve/Deny” drop-down.
I've tried selecting different Fields from the Approver secondary list, but can't seem to get the field on the form to update correctly based on the drop-down selection.  I have a rule set on the Drop-down field to set the vpusername field.. The Condition
is currently “If vpApprov is not blank” ..
When I get to the Value part, I can't figure out how to "grab" the AccountID of the VP Approver selected and store it in the field on the form. The fields I see in the secondary list under person are "DisplayName", "AccountID",
and "AccountType".
Thanks in advance for any help you can give me!!
Shane Meisner
SharePoint Solutions Architect

Answer 1

Hi,
From your description, my understanding is that you want to store account id to a filed based on a lookup column.
You could accomplish your requirement with Workflow, you could create your workflow with these steps below:
Create a local variables.
Use Set Workflow Variable action to set value to the variable.
Use Set Field in Current Item action to set value to the column(Please refer to the screenshot below).
And the screenshot below is the list15 and result in my environment.
Best Regards,
Vincent Han
TechNet Community Support
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