How to display cell comments based on 2 conditions

Hi ,
I have set up a file which has 3 sheets; output, assumptions, & comments. objective of the file is to compare the selected month profit & loss for each contract against the prior month. Comments against the variance need to stored separately so that it could be displayed to the audience who will review the report. I need help to display the comments for each selection. Would appreciate a way to record the comments first and than display it upon selection. File attached

Please review the requirement in conjunction with the attached file

Thanks