How to create a point under a coordinate system?

Hello,

This must be very elementary, but how can I create a point under a coordinate system?

My goal is to have a point that remains at the same position relative to a coordinate system, even when the coordinate system is relocated (translated and/or rotated).

For example, suppose there is some pre-existing CSYS.

I want to create a point relative to this CSYS.

When I move the CSYS around, I want the point to accompany it.

Currenlty, I can only create points that remain at their original locations and don't follow the relocation of the CSYS.

Note 1:

I can use "Set WCS to Datum CSYS", but that only works at creation time, there is no persistent associativity between the point and CSYS.

Note 2:

During the creation of the point, I can select "Existing Point" and then click on the origin of the CSYS. This will create the desired associativity between point and CSYS, but it only works when the point coordinates relative to CSYS are (0,0,0).

Thanks,

Marcio Tokita