If I understand the question correctly, you'd like to be able to run sub A in file A from file B. To do this, you can use Exporter:
File A
package PackageName;
require Exporter;
our @ISA = qw(Exporter);
our @EXPORT = qw(moo); # Put function names, seperated by
+ spaces,
# that you want to be able to use
sub moo {
# do stuff
}
File B
use PackageName;
moo();
Basically, you're creating a simple module. You'd also be able to accomplish what you want it via eval, but modules are cleaner.
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