Sensitivity

I'm sorry I keep repeating the same thing over and over again. You have fixed the total amount in F9 to be equal to the fixed value of D9, so varying C4 and C5 does not change the total amount in F9.

Put another way: since the amounts in F4:F8 vary exactly the same as the percentages in C4:C8 (since F4=C4*$D$9 etc.), you keep the total fixed.

If you drop the requirement that C4:C8 sum to 100%, you could create a working data table.

In the screenshot below, I replaced the formula in C6 with the value 9%. If you then vary C4 and C5, the sum won't be 100% anymore, and the total amount won't be $0.83 anymore.