#~~~  Store Credentials in Text File ~~~
$SString = "MyPassword" | ConvertTo-SecureString -AsPlainText -Force
$ToFile = $SString | ConvertFrom-SecureString
$ToFile | out-file "path"

#~~~  Get Credentials From Text File  ~~~
$FromFile = get-content "path"
$Password = $FromFile | ConvertTo-SecureString -AsPlainText -force
$User = "username"
$Credential = New-Object System.Management.Automation.PSCredential `
 -ArgumentList $User, $Password

#~~~  Find Chassis Type (used in line 44) ~~~
$chassis = Get-WmiObject win32_systemenclosure | select chassistypes
if ($chassis.chassistypes -contains '3'){$chassis = "_desktops"} #"Desktop"
elseif ($chassis.chassistypes -contains '4') {$chassis = "_desktops"} #"Low Profile Desktop"
elseif ($chassis.chassistypes -contains '5') {$chassis = "_desktop"} #"Pizza Box"
elseif ($chassis.chassistypes -contains '6') {$chassis = "_desktops"} #"Mini Tower"
elseif ($chassis.chassistypes -contains '7') {$chassis = "_desktops"} #"Tower"
elseif ($chassis.chassistypes -contains '8') {$chassis = "_laptops"} #"Portable"
elseif ($chassis.chassistypes -contains '9') {$chassis = "_laptops"} #"Laptop"
elseif ($chassis.chassistypes -contains '10') {$chassis = "_laptops"} #"Notebook"
#elseif ($chassis.chassistypes -contains '11') {$chassis = #"Hand Held"
elseif ($chassis.chassistypes -contains '12') {$chassis = "_laptops"} #"Docking Station"
elseif ($chassis.chassistypes -contains '13') {$chassis = "_desktops"} #"All in One"
elseif ($chassis.chassistypes -contains '14') {$chassis = "_laptops"} #"Sub Notebook"
elseif ($chassis.chassistypes -contains '15') {$chassis = "_desktops"} #"Space-Saving"
elseif ($chassis.chassistypes -contains '16') {$chassis = "_desktops"} #"Lunch Box"
#elseif ($chassis.chassistypes -contains '17') {$chassis = #"Main System Chassis"
#elseif ($chassis.chassistypes -contains '18') {$chassis = #"Expansion Chassis"
#elseif ($chassis.chassistypes -contains '19') {$chassis = #"Sub Chassis"
#elseif ($chassis.chassistypes -contains '20') {$chassis = #"Bus Expansion Chassis"
#elseif ($chassis.chassistypes -contains '21') {$chassis = #"Peripheral Chassis"
#elseif ($chassis.chassistypes -contains '22') {$chassis = #"Storage Chassis"
#elseif ($chassis.chassistypes -contains '23') {$chassis = #"Rack Mount Chassis"
#elseif ($chassis.chassistypes -contains '24') {$chassis = #"Sealed-Case PC"
else {$chassis = "Unknown"} #"Unknown"

#~~~  Find OS (used in line 44) ~~~
if (((Get-WmiObject win32_operatingsystem).caption |out-string) -match "7") {$OS = "W7"}
if (((Get-WmiObject win32_operatingsystem).caption |out-string) -match "10") {$OS = "W10"}

#~~~  Combine Chassis Type and OS into single variable (used in OU path)  ~~~
$SysInfo = "$OS" + "$chassis"

#~~~  Find Region Via Default Gateway (used in OU path)  ~~~
$address = get-WmiObject Win32_NetworkAdapterConfiguration | Where {$_.ipaddress.length -gt 1}
$AddressString = $address.defaultipgateway[0] | out-string -stream

$match = import-csv "path" | where {$_ -match "$AddressString"}
$region = $match.region

#~~~  Combine Remaining Variables and Join to domain  ~~~
$ouPath = "OU=$SysInfo,OU=$region,OU=Computers,OU=xxxx,OU=xxxxxx,DC=xxxx,DC=xxxx,DC=net"
add-computer -domainname xxx.xxx.xxx -credential $credential -OUPath $ouPath