I think I know what you're looking for, but there are a couple of problems to resolve, first.

Let's start with how you name modules. Given the two names you have (ABC::plot_XML.pm and ABC::plot_BLABLA.pm), here's what you need:

1. A directory somewhere in @INC (which usually includes '.') named 'ABC'
2. Two files in that directory, named 'plot_XML.pm' and 'plot_BLABLA.pm'
3. These files have statements package ABC::plot_XML.pm; and package ABC::plot_BLABLA.pm, respectively.

I suggest a quick review of perlmod, as it covers the basics nicely.

Now, to find which 'ABC' modules are available from within your script 'abc.pl', you can use Module::Find:

use Module::Find;
# my @found = findsubmod('ABC');  #if you want all ABC::* modules
my @found = grep { m/^ABC::plot_/ } findsubmod('ABC');  #all ABC::plot
+_* modules
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