add/copy remaining directories/files to the current branch

[KM]

I have a question which may be stupid to some of you - 
 
There is a branch created in our CVS (FYI - CVS version server: Concurrent 
Versions System (CVS) 1.11.22 (client/server) in case it matters), with 
directories xyz/abc and xyz/xx included.   It should have been all of xyz, not 
just those 2 directories.    Developers have been working on files in these 
directories for months.  It was a temporary branch that I did not create.  I 
always branch from the top of (including all of) the xyz directory.
 
Now i want to make sure that the entire xyz tree is represented in the branch.  
(i know when checking out I can use the -f option to see it this way, however 
our build scripts do different types of check outs and this is not included, 
and probably should not be included in our commands).
 
So to the question..... If I want the rest of the xyz tree to be in the branch 
as it appears in the head how do I do that?   
 
Do  I use rtag again - only specifying "-r HEAD -b <branch> <explicit 
directories>"  or something.  Would it be better to make a new branch from the 
head and copy these changes over since we don't care about merging right now?  
(merging back to trunk will come later).
 
Basically I want to add the other xyz files/directories that are missing from 
the branch currently, to the branch, without undoing or losing what is already 
there.  
 
Sorry if this is dumb.
KM