Populate Dynamically

Hello
I have several forms, each with a “Subtotal” field based on the values ​​the user enters.

I also have an “Exchange Rate” (numeric field) in each form.

Finally, in each form, I have a total (numeric field) in which the calculation is activated as the following:

{Subtotal:1}*{Exchange Rate:2}

Considering that every day, my exchange rate Value changes, and opening each form daily and manually changing the value of this field is exhausting, I want to be able to specify the exchange rate at once in another single form or somewhere in the WordPress Admin area; This value should be applied to all exchange rate fields in forms.

I have enabled the “Allow field to be populated dynamically” for the exchange rate field in each form, but I don’t know the rest of the steps.

I would be grateful if someone could guide me.

Regards

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