You could create a new measure (see you if it's better a new calculated itam or a new aggregated measure) that consider the diffence between the last month and the sum of the last three month. Applay as visualization rule this difference to the column that you wish
SAS Innovate 2025: Save the Date
SAS Innovate 2025 is scheduled for May 6-9 in Orlando, FL. Sign up to be first to learn about the agenda and registration!