MATRIX help

Hi I want to select 2 inputs from 2 drop down lists (done) on a risk matrix ie "possbility" against "severity" and have another cell automaticaly input the HIGH MEDIUM or LOW from my existing excel 4 x 5 matrix in the same colours.

Column4 Column5 Column6
Very Serious Rare


Rare Unlikely Possible Likely Almost Certain
Major MEDIUM MEDIUM HIGH HIGH HIGH
Very Serious LOW MEDIUM HIGH HIGH HIGH
Serious LOW MEDIUM HIGH HIGH HIGH
Significant LOW LOW MEDIUM MEDIUM MEDIUM
Slight LOW LOW LOW LOW MEDIUM
No Impact LOW LOW LOW LOW LOW




Appreciate any help for a novice user

Best regards