Just type Monday or Mon or which day it is (Tuesday or Tues) into A2, then pull that down. Excel has built in lists called 'custom lists' that repeat commonly used items.
Then in a new column type =if(A2="monday",B2,"")
So if A2 equals monday, put in the income field (b2) otherwise put nothing.
Then you are on the way to separating out income from days of the week into separate columns.