With the vSphere PowerCLI its possible to deploy multiple virtual machines from templates defined in a CSV file.
The CSV file needs contain the following column headings exactly for the below script to work.

Name
Template
DestinationHost
CustomSpec
NumCpu
MemoryMB

You will need an existing template you have created prior and also a guest OS customisation specification.

Connect-VIServer vcenter1.vmadmin.co.uk

$VirtualMachinesCSV = "C:\VMsFromTemplate.csv"
$strDescription = "Created from template and CSV by Andy Barnes"

$VirtualMachinesDetails = Import-CSV $VirtualMachinesCSV
$VirtualMachinesDetails | %{ New-VM -Name $_.Name -Template $(Get-Template  $_.Template) -VMHost $(Get-VMHost $_.DestinationHost) -OSCustomizationSpec $(Get-OSCustomizationSpec $_.CustomSpec) }
$VirtualMachinesDetails | %{ Set-VM -VM $_.Name -NumCpu $_.NumCpu -MemoryMB $_.MemoryMB -Description $strDescription -Confirm:$false }
$VirtualMachinesDetails | %{ Start-VM -VM $_.Name -Confirm:$false }