How to feed some mesh points manually in HFSS

Yes.

Look into the HFSS help for meshing controls. Creating vurtural objects, discussed here can also be helpful.

Thanks!

Menuitems of HFSS\mesh operations\.. are not what I want to discuss here..

I have tried below actions:
1. Adding a point object on the surface of the object I want to mesh.
The point can't be a model object. It doen't works.

2. Draw a sheet (e.g. rectangle) on the surface.
If it is assigned non-model object property, this doen't work...
If it is assigned model object property, this works!

Any comment?

You have created a vurtural object (" If it is assigned model object property, this works! ") and this will concentrate the mesh in the immediate vicinity.

It is occasionally a very useful feature particularly when you want to focus your attention to some part of the model.

I see.
Thank you!