Does this answer your question ?
https://www.openbsd.org/anoncvs.html
Quote:
Updating an existing tree
If you are following -current:
$ cd /usr/src
$ cvs -q up -Pd -A
If you are following the 6.2 -stable branch:
$ cd /usr/src
$ cvs -q up -Pd -rOPENBSD_6_2
Every time you run this, cvs(1) synchronizes your /usr/src tree. It does not destroy any of your local changes; rather it attempts to merge changes in.
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Seems clear enough to me :
""If you are following the 6.2 -stable branch:"" Or what ever branch you are following.IE: "If your following current"
For a lot of details on OpenBsd Ports
https://www.openbsd.org/faq/ports/guide.html
The best place to start though , is here:
https://www.openbsd.org/faq/ports/ports.html
Quote:
Introduction
The ports tree is meant for advanced users. Everyone is encouraged to use the pre-compiled binary packages. If you have questions about the ports tree, it is assumed that you have read the manual pages and this FAQ, and that you are able to work with it.
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Also there is a lot of info in :“man cvs” and “man ports” if you’re interested in learning more.