Hi,
Assuming that the 2 leftmost letters in D are the ones that you want to match in column A.
- Select the range D1:E6
- In the Home tab, conditional formatting
- New rule
- Use a formula to determine which cells to format
- Enter this formula: =MATCH(LEFT($D1,2),$A$1:$A$100,0)
- Set the desired format and OK, OK