Forum Post: RE: How to auto populate the fields values from one entity to another entity on selection of the custom button

Hi Rahul, > First you need to create or decide which target field you will auto populate these fields value (as you said you don't have these fields there). > Do you need to update this values to all of the product details, then you can retrieve all order details based on sales order id and update them one by one using Rest. check SDK sample for update. > Call that js code from your button click. Thanks