dynamically bind multiple texture in a mesh

I'm kind of new to Unity3D. So, please consider it when you answer.

What I want is to make pottery maker game. After user makes the shape, user will design the pottery, which means, they will select textures or colors for part by part.

I googled of course, but I don't really understand what I have to do for "dynamically change textures". I know how to change texture, or material of a whole mesh. It's easy. But in my case, I have to color or put texture for the part of a mesh(pottery). For example, I will divide the pottery vertically into 10 parts which has 10 percent of height. In the aspect of 3D model, it will have 10 different sub-mesh or material.

Before user design the pottery, user will deform pottery, So, 10 parts should not be seperated meshs. They must be a mesh to adjust my deformer.

I saw this kind of answers but this way is static. My case must be dynamic as user selects design in real time. http://answers.unity3d.com/questions/22961/multiple-textures-layered-in-a-single-mesh.html

I will export model from Cinema 4D as fbx. Can anyone help me?

Picture bellow is the pottery maker game on mobile. I want to make similar game. As you can see, colors or textures must be worn in part.