What does it mean , 'Craig-Bamptom - 3D EB beam model, 3 interface frames, 100 elements, 18 static modes, 10 dynamic modes' ??

I folllowed this exemple which is about Flexible Body Models in Simscape Multibody, i want to do the same analysis using simple wing structure instead of simple beam. I'm currently discontinued in the second method (finite element method) and exactly in reduced mass and stiffness matrices by Craig-Bamptom Method.