How would I use Bezier curves on the y axis

[samuelissad (Sam)]

How would I use bezier curves on the y axis, currently, it looks fine on the x and z:

But how would I place the points on this section as every time I do it, it looks wrong or weird.

[7z99 (cody)]

What would you want your end result to look like?

[Brnd5001 (Bluento)]

Could you give more details about what you are trying to achieve?

[samuelissad (Sam)]

i would want it to look like this post