I don't understand your question, you access array-elements via the subscript @array[$pos] or as $_ within an iterating construct...

Let me rephrase your code a bit:

# splice of the residue array after the first matching element
# note the last, we finish the loop once we found $sorted_nums[0]
my $pos = 0;
foreach(@start_incline) {
    (@inline = @start_incline[$pos+1 .. $#start_incline], last) if ($_
+ == $sorted_nums[0]);
    ++$pos;
}

# do work with it
foreach(@incline) {
    print $_ . " ";
}
[download]

If you intend to splice of the residue after the last matching element:

my $pos = $#start_incline;
foreach(reverse @start_incline) {
    (@inline = @start_incline[$pos+1 .. $#start_incline], last) if ($_
+ == $sorted_nums[0]);
    --$pos;
}
[download]

I hope this helps a bit, as I don't understand the question, I doubt it ;-)

regards,
tomte

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Edit: fixed comment in snippet ($#start_incline became $sorted_nums[0])
Hlade's Law:

If you have a difficult task, give it to a lazy person --
they will find an easier way to do it.