Creating sq. mesh inside a mesh unity C#

I’m making a mesh utilizing this code snippet.
[ContextMenu(“Generate Mesh”)]
void GenerateMesh()
{
meshHSK = new Mesh();
meshHSK.identify = “Space Mesh”;
meshFilter.mesh = meshHSK;

    Vector3[] polygonPoints = new Vector3[areaPositions.Count];

    for (int i = 0; i < areaPositions.Rely; i++)
    {
        polygonPoints[i] = areaPositions[i];
    }
    meshHSK.vertices = polygonPoints;


    var totalVerts = meshHSK.vertices.Size;
    var totalTriangles = totalVerts * 3;

    polygonTriangles = new int[totalTriangles];
    for (int ti = 0, vi = 0, y = 0; y < ySize; y++, vi++)
    {
        for (int x = 0; x < xSize; x++, ti += 6, vi++)
        {
            polygonTriangles[ti] = vi;                  //0=0   //
            polygonTriangles[ti + 1] = vi + xSize + 1;  //1=2
            polygonTriangles[ti + 2] = vi + 1;          //2=1
            polygonTriangles[ti + 3] = vi + 1;          //3=1
            polygonTriangles[ti + 4] = vi + xSize + 1;  //4=2
            polygonTriangles[ti + 5] = vi + xSize + 2;  //5=3
        }
    }

    meshHSK.triangles = polygonTriangles;

    meshHSK.RecalculateBounds();
    //meshHSK.RecalculateNormals();
}

However right here comes the brand new factor which i need to do. Is to generate sq. mesh (with a particual distance/space). I need to divide with additional meshes utilizing a sepecific wdith top.