Not sure if I'm getting you correctly ... I think you should write your subroutine like this

sub way {
  my $aa = shift;
  $aa->MethodCall(@_);
}
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The shift takes the first argument out of @_ and puts it into $aa, the rest of the arguments are passed to MethodCall (and they are still an alias to the original variables, not a copy like in the call $aa->MethodCall(@bb)). I suppose there's a typo in your code

#$aa->MethodCall($main::a,$main::c);
# should be
#$aa->MethodCall($main::b,$main::c);
#                      ^^^
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As a side remark, don't use the variables $a and $b as normal variables in a program, they are special to perl (see sort).

-- Hofmator