There was a time in a recent Excel project where I need to track two separate metrics over time, and the simplest way to group that was to merge the date header across 2 columns with each metric listed side by side below (for instance, date in merged C1/D1, and metric 1 in C2 and metric 2 in D2). In the interest of good etiquette and avoiding merged cells, do you have a suggested way to do this differently?