Mesh generation from surface model
 

What commands should I used to generate a mesh from surface model and connect the new mesh to the old mesh?

You can couple two meshes together using the cpcreate command (to create a couple)

cset news zone (select the mesh in the vicinity of the interface)
cpcreate cset

Is this what you are asking for?

sorry for a confusing question. I want

1) to create a new mesh from a group of points. Please see http://www.whlam.com/d3.jpg

2) match the new mesh to existing mesh.

:)