Hi guys,
I have a mesh consists of many different submashes, and from a loop, I'd like to find the coordinates of each and every submashes in aspect to the big mash, and create a box which can be aligned to the centre and sides of the submashes, how can I achive that idea? Thanks a lot!

Best way I think is to calculate it's bounding box yourself.

Find an example of vertex manipulation and go through all vertices in the submesh.
If the vertex position is lower than the previous lowest or bigger than the previous highest, etc, that way you can make your own Bounds and get various data easily, like the center position.

Thanks Sodan, I was reading articles regarding to the GetSomeGeometry function, but very few were found, I'm wondering if this is the right path to do this, what is the usage of the GetSomeGeometry function? Please advise, thank you!

Took a look, yes that is the function, sadly only commercial license holders had examples in source code from the editors side.
But it is really simple you should have been able to see it from intellisense (taken if you use Visual Studio of course).

Here is how you can use it to your situation:

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            List<Vec3> positions = null;
            mesh.SubMeshes[n].VertexData.GetSomeGeometry(ref positions);

            Bounds subMeshBounds = MakeBoundsFromPositions(positions); // <-- you make this function

There is also a shared vertices check in where I looked, you might want to do this first:

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VertexData vertexData = subMesh.UseSharedVertices ? subMesh.Parent.SharedVertexData : subMesh.VertexData;

I hope you can carry from this on.

OK, sounds execiting, I am using the commercial lisence(the one below source code edition), can you please tell me where to look for the example source code? Is it under the MapEditor example ? Thanks again!