How would I do terrain painting in percents?

Right now I have a terrain which is 100% Grass, and I want to make it so it is 70% grass, 20% mud, and 10% rock with the command bar.
However, I don’t know how to do this in scripting.
I have tried looking on the DevForum, watching Youtube, and finding answers on Google.
I don’t want a script given to me, I just want an answer on if it can be done, and how, with just a general description.

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Maybe a way you could perform this is to create terrain for each example you have, and have the properties stored. Then, generate the terrain giving the guidelines of 70% grass, 20% mud, and 10% rock.

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