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$ perl -Mstrict -Mwarnings -E '
> my $text =
...
> substr $text, $_, 0, q{-} for reverse @cums[ 1 .. $#cums ];
> say $text;'
20130204000000000-068100-8361002201306810020022013068800-020-049-4

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perl -Mstrict -Mwarnings -E '
my $text =
...
push @cums, $_ + $cums[ -1 ] for @offs;
substr $text, $_, 0, q{-} for reverse @cums[ 1 .. $#cums ];
say $text;'