How to edit materials of specific shades in Coloramp

Once we have made two different phases, using coloramp, how do we edit material properties of only specific colored areas in Blender? As an example, I am attaching the photo, where I need to change the material of upper white half area of the cube to transparent/different color?

You can use the output of the colour ramp as a mask for many different things, by plugging it into the factor of another node (for example mix colour, mix shader etc)

Edit
to make the top half transparent feed it into the alpha socket of the principled node, you will have to put an invert colour node in-between (or flip the black and white colour stops of the colour ramp) if not it would be the bottom half that turns transparent. Black will be transparent and white opaque.

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