Nested variable help

Hi,
I have looked around and been unable to find an answer, if one already exists I apologize in advance.
I have a menu built in powershell for use from the CLI, but need help in properly nesting variables and then reading them back.
I create a variable to store systems from site1, systems from site2, systems from site3, etc.
##Singapore
$global:mySinStorage1 = "system1_1"
$global:mySinStorage = "system1_2"
$global:AllSin = $global:mySinStorage1,$global:mySinStorage
##Budapest
$global:myBudStorage = "system2_1"
$global:myBudStorage = "system2_2"
$global:AllBud = $global:myBudStorage1,$global:myStorage2
Calling $global:AllBud or $global:AllSin works without issue, however when trying to build a grouping for easier updating, I am missing something(probably simple.
##All EMEA
$global:myEMEAStorage = {$global:AllBud,$global:AllSin}
This seems to create a variable with two strings made of each original variable, which as I understand is to be expected. Is there an easy way to rebuild this variable with each entry as a separate entity so processing and parsing can read them?
Currently I have these larger entries with each system specified, this has lead to variables with 120+ hand entered entries. Needless to say this very easily has lead to misses/errors.
Thank you for any help,
Scott

Here is how to use variables in PowerShell or any other obect system.
$cityhash=@{
City=''
Storage1=$null
Storage2=$null
$cities=@()
##Singapore
$cityhash.City='Singapore'
$cityhash.Storage1 = "system1_1"
$cityhash.Storage2 = "system1_2"
$cities+=[pscustomobject]$cityhash
##Budapest
$cityhash.City='Budapest'
$cityhash.Storage1 = "system1_1"
$cityhash.Storage2 = "system1_2"
$cities+=[pscustomobject]$cityhash
# get a city
$p=$cities | ?{$_.City -eq 'Budapest'}
$p.Storage1
¯\_(ツ)_/¯

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