You can check the change like AND(ISBLANK([JAN]),[_THISROW_BEFORE].[JAN]<>[_THISROW_AFTER].[JAN]) but you need to use OR and 12 condition checks… quite big formula. You could merge your columns with an additional column like [JAN]&[FEB]&… and then you would need to check only one column is it changed or not.
Let’s say I could create 12 workflows (for each month ) which sends a rent payment receipt, when it’s respective month is changed to “Paid”, how do I make the workflow to only work when there is a change/update on a specific column? (That particular change on that column, must be the only thing that triggers the workflow )
Without knowing your structure, then you could create 12 different workflows where the condition rule in January is AND([_THISROW_AFTER].[JAN]=“Paid”,[_THISROW_BEFORE].[JAN]<>[_THISROW_AFTER].[JAN])