You want a hash of arrays. That simplifies the logic and puts the data all in one place. 

my %data = (
    foo1 => [
        '1 - 201 - 229',
        '2 - 201 - 229',
        '3 - 201 - 229',
    ],

    foo2 => [
        '1 - 201 - 218',
        '2 - 201 - 218',
        '3 - 201 - 218',
        '4 - 201 - 218',
        '5 - 201 - 218',
        '6 - 201 - 218',
        '7 - 201 - 218',
   ],

# . . . 
);

[download]
Then you can just say, 
my @act_bsites = @{$data{$dataset}};

[download]
If the 1-150 ordering is natural and important, you may want to drop the 'foo' part of the designation and use an array instead of a hash.

Update: I don't understand how hardcoding the data in an extended if-else construct improves anything with respect to hard-won data. Here's a version with a seperate data file: 

# file: /path/to/foosites
{
    foo1 => [
        '1 - 201 - 229',
        '2 - 201 - 229',
        '3 - 201 - 229',
    ],

    foo2 => [
        '1 - 201 - 218',
        '2 - 201 - 218',
        '3 - 201 - 218',
        '4 - 201 - 218',
        '5 - 201 - 218',
        '6 - 201 - 218',
        '7 - 201 - 218',
   ],

# . . . 
};

[download]
and then in your code it can be as simple as, 
my @act_bsites = @{(do '/path/to/foosites')->{$dataset}};

[download]

After Compline,
Zaxo

In reply to Re: Accessing Large Else-If Condition in a Separate Files by Zaxo
in thread Accessing Large Else-If Condition in a Separate Files by neversaint

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