Here is an example of adding a newly created package. This example assumes that your CVS stuff is kept in /usr/cvs and pkgsrc is a subdirectory from there. The new package, foo/bar  in this case, is in the directory /usr/cvs/pkgsrc/foo/bar.work. The steps to import this package into the source tree are:

cd /usr/cvs/pkgsrc/foo/bar.work
	
# do the usual testing, pkglint, etc. 
# don't forget to do 'make makepatchsum' to generate the
# files/patch-sum file.

grep TNF /usr/pkgsrc/doc/pkgsrc.txt

# this command tells me the correct syntax for "cvs import". 
# (/usr/pkgsrc is a symlink to /usr/cvs/pkgsrc).

cvs -d imil@cvs.netbsd.org:/cvsroot import pkgsrc/foo/bar TNF pkgsrc-base 

# note it's "bar", not "bar.work"

As the import log :

Initial import of bar, version 1.0.0, into the NetBSD Packages Collection.

<DESCR>

cd ../../..
cvs checkout pkgsrc/foo/bar 

# this checks out the newly imported package to 
# see if everything went ok

cd pkgsrc/foo
cvs update Makefile
vi Makefile 

# add bar to the pkgsrc/foo/Makefile

cvs ci -m 'add & enable bar' Makefile

# check in the changes to pkgsrc/foo/Makefile

cd /home/imil/netbsd-cvs/pkgsrc/doc
cvs update CHANGES-YYYY

# this makes sure you have the most up to date CHANGES

vi CHANGES-YYYY

# make a note of your changes to the foo/bar package

cvs ci -m 'Added foo/bar version 17.42' CHANGES-YYYY

# check in CHANGE