First some points that will help you forever:

#!/usr/bin/perl
use warnings;

# can be simplified to just #!/usr/bin/perl -w
# this will work even on Windows!! Windows Perl doesn't look 
# at the path, but it does look at the -w trailing thing.

You will see this often at the start of a Perl program:
#!/usr/bin/perl -w
use strict;
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Warnings has a runtime impact, but normally I would "use warnings" except in the case of very well debugged, high performance code and even then I would think twice about leaving warnings out!

I would add "use strict;". Strict is a compile time thing and has no impact upon code execution time. It enforces scoping rules as one of the main things. Your code doesn't compile under "strict".

The syntax: &sub_name is deprecated. You can just say "sub_name;" or "sub_name();, or sub_name($parm1, $parm2)".

sub menu_system($bs_index){....} is wrong in Perl.
Perl does have a prototype mechanism but is not strongly typed (to say the least!). In any event the Perl prototype mechanism could say something like: I require at least 3 and possibly 4 scalar values. Calling the sub with 2 or 5 values would be rejected during compile. Most Perl programs don't even worry about this and for your first code, I would wouldn't either and I'm not even going to demonstrate this syntax because I don't think you need it.

A Perl sub gets a "stack" of stuff. The Perl subroutine does what it wants with this "stack of stuff".

Update: I forgot to add this sub param stuff:

sub A
{
  my $parm1 = shift;  #effect: literally shift off the stack passed
}

sub B
{
  my ($p1,$p2,$p3) = @_; #effect: make copy from stack passed
}
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I am a bit confused with your code, but I will present the Perl way of a standard command loop that uses text as a command:

while ( (print "Enter Command: "), 
        (my $line = <STDIN>) !~ /^\s*q(uit)?\s*$/i  
      )
{
   next   if $line =~ /^\s*$/;        #skip new lines
   next   if $line =~/^\s*skip/i;     #skip is a no op command
   insert if $line =~/^\s*insert/i;   #do insert command
   delete if $line =~/^\s*delete/i;   #do delete command
   #...etc..
}
sub insert()
{...}
sub delete()
{...}
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There are of course many variations on the above. But it is short and to the point.

I recommend not trying to be overly complex. I have written fancy hash driven dispatch tables, but I don't think that is what you need.

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