1. Main CSV

2. Main column index Tips: If col names are: ID, Name, Age → then index to be ID=0, Name=1, Age=2

3. Lookup CSV From which file to find and combine

4. Lookup column index Tips:Index of which col to find for matching. Same ID as above.

5. Return column indexes (comma separated) Tips: Which cols you want to combine like 5,6,7 of the lookup csv file.

Run VLOOKUP