Thank you for responding, your answer inspired me to do a little more poking around and now I think I understand.
I can just update the ports tree using the branch tag I am moving to.
In case others stumble on this post, this link explains it a little more clearly, under the "Accessing Branches" header:
http://cvsgui.sourceforge.net/howto/cvsdoc/cvs_5.html
Quote:
Accessing branches
You can retrieve a branch in one of two ways: by checking it out fresh from the repository, or by switching an existing working copy over to the branch.
To check out a branch from the repository, invoke `checkout' with the `-r' flag, followed by the tag name of the branch (see section Creating a branch):
$ cvs checkout -r rel-1-0-patches tc
Or, if you already have a working copy, you can switch it to a given branch with `update -r':
$ cvs update -r rel-1-0-patches tc
or equivalently:
$ cd tc
$ cvs update -r rel-1-0-patches
It does not matter if the working copy was originally on the main trunk or on some other branch -- the above command will switch it to the named branch. And similarly to a regular `update' command, `update -r' merges any changes you have made, notifying you of conflicts where they occur.
Once you have a working copy tied to a particular branch, it remains there until you tell it otherwise. This means that changes checked in from the working copy will add new revisions on that branch, while leaving the main trunk and other branches unaffected.
To find out what branch a working copy is on, you can use the `status' command. In its output, look for the field named `Sticky tag' (see section Sticky tags) -- that's CVS's way of telling you the branch, if any, of the current working files:
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