Complex Vlookup

In the attached worksheet, I want to lookup values from tab 'KW' to the Tab 'Stock'.
For eg. In columns B,C,D & E I want values against the SKU in Column 'A' but it has to reference the header for columns B,C,D & E with the headers in tab 'KW' to give the value for the respective SKU. What formulas can i use to achieve this?