Lets say you have ArrayofArrays x. To add $value to row 5 do this:

push @{$x[5]}, $value;
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The nice thing: it does not matter whether row 5 existed before, it will be created when needed (this is called autovivication)

To remove values from the end of a row you use pop

$value= pop @{$x[5]};
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To remove the first value instead use shift:

$value= shift @{$x[5]};
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To remove or add values into the middle of an array use splice. Do 'perldoc -f splice' on the command line to read more about that

To access one or all values of row 5 or all rows you do this:

#access one value in row 5
$n= $x[5][4]; 
#access all values in row 5
foreach $n ( @{$x[5]} ) {
 
}
#access all values in @x
foreach $row ( @x ) {
  foreach $n ( @$row ) {
    
}
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The syntax @$row is shorthand for @{$row} which you have seen above