Acting on a subport in a development Portfile

[Georges Martin]

When working on a Portfile in a macports-ports clone, it's possible to perform 
actions in its directory, without giving the port name (and not adding the repo 
 to sources.conf):

        $ cd ~/repos/macports-ports/<category>/<portname>
        $ port info
        $ port lint
        $ sudo port build

But if the Portfile contains a subport, how can I invoke actions on the subport 
?

Do I really need to add that repository to sources.conf ? And rerun portindex 
every time I switch branches ? :-q

G.

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