website design – Mapping of column fields from CSV file with currently available fields

You can try really intuitive like Match the following which we have done in our childhood.

i can suggest you few interactions but you have to be precise with visuals as if not properly visualised it may end up bad.

but make sure when you hover on a single item other lines(lines of other elements) will have opacity 50% so that they may not effect visibility
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Here you just drag the item in the list1 and put it under item2 of other list.

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