I have a sheet where I have data specific to each day in a separate column. 

Day 1  Day 2 
  A        X
  B        Y
  C        Z
I want to have another section on the same sheet that breaks down data specific to a day.
Day 1 Breakdown
[A] [A*2] [A*3]
[B] [B*2] [B*3]
[C] [C*2] [C*3]

OR

Day 2 Breakdown
[X] [X*2] [X*3]
[Y] [Y*2] [Y*3]
[Z] [Z*2] [Z*3]
Is there a way where I can have a single cell change whether Day 1 or Day 2 is broken down in my "breakdown section"?