How to build only a subset of targets under a directory

Is there a way to build only a subset of targets under a directory, instead
of all targets under that directory?

For example:

top/aa
  Alias('bin', bin_a)
  Alias ('test', test_a)
top/bb
  Alias('bin', bin_b)
  Alias ('test', test_b)

scons top/aa # builds bin_a and test_a
scons bin # builds bin_a and bin_b

I want to do something like:
cd top/aa; scons bin # build only bin_a

I know that I can define more aliases, but doing so is a maintenance
headache.  Is there better way?

Thanks,

Jay

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