two project share a common subsystem

hi, folks

i am thinking about how to use svn to help this kind of projects. the
project A has already well in svn and we just want to start another
project B for another application. but the B is very similar to A,
and is expected to share a common substem, say C, of project A. the A
have not yet fully completed as well as the subsystem C.

does this indicate a chance of using branch? and, how? is there any
good practice aroud here? thanks in advance.

-- 
woody
then sun rose thinly from the sea and the old man could see the other
boats, low on the water and well in toward the shore, spread out
across the current.
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