$ perl -Mstrict -Mwarnings -E '
> my $text =
>    q{2013020400000000006810083610022013068100200220130688000200494};
> my @offs = ( 17, 6, 31, 3, 3 );
> my @cums = ( 0 );
> push @cums, $_ + $cums[ -1 ] for @offs;
> substr $text, $_, 0, q{-} for reverse @cums[ 1 .. $#cums ];
> say $text;'
20130204000000000-068100-8361002201306810020022013068800-020-049-4