Merge Data cells based on Primary Key

[VbaHell]

Hello all

I hope you can help on this please

I have a workbook which is sent out to a user to update Columns "W" & "X"

Columns "C" & "H" & "O" combined make up a primary key

I want to save the users updated file in a folder

Open up my master file and run a macro that points to the folder and then matches up the primary key and populates columns "W" & "X"