For the sake of data integrity in a big sheet that has a column for a cost name and its amount, I need the same values to be populated for the same cost name. for instance: if one column has items names and the second has values:
Item1 20
Item2 30
Item3 40
Item 1 (I need to have here 20 in this cell)
Item3 (I need to have 30 in this cell)
I read about the combination of Collect and Index in one answer but I am not sure how it can work in my case?