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How can I auto-populate a Power App field based on the choice of another field



I am working on creating a "marketplace" type of Power App or Customized Form and would like to auto populate one field based on the choice of another field. 


I have a basic SharePoint list with the product information: title, serial number, description, condition, and price. I created a second list with a dropdown of the available serial numbers, the price, and a comment column. Users will be directed to the second list when purchasing after looking at items available on the SharePoint page. The goal is for the user to select the desired serial number of the product they are purchasing, then the price of that product to auto-populate into the form once the serial number, or item number, are selected. Trying to avoid folks entering their own prices and to save data entry time. Is this possible? Lookup column does not work for this use case as I want the selected serial number to match the price vs users selecting the price. Thanks so much! 



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