tagging and branching of modules in a repository

[Xapp]

Greetings,

I am currently maintaining some code in a 2 monolithic cvs
repositories.

A/3rdparty
A/project1
A/project2

B/project3
B/project4
B/otherDir

When I started working with these repositories the only builds (asside
from developer's private builds) where done by tagging building all
sources.  As these projects diverge, I have been tagging only dependant
modules necessary to build an individual app.  E.g. project1 depends on
sources in project3 so I apply tags and branchtags like so:

cvs rtag -rALLSRC_01 APPLICATION_1_0_0_3 A/3rdparty A/project1
B/project3

I have 2 questions:
1. Is this tagging method acceptable?
2. If so, when I check out thusly: cvs co -rAPPLICATION_1_0_0_3 A B,
why do I get some extra directories and sources that where not
explicitly tagged (e.g. B/otherDir)

--Russ

"Everything you see, I owe to spaghetti." --Sophia Lauren