Create a SharePoint Subsite from Custom Site Template using PowerShell

Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

#Custom function to create a site from site template
Function Create-SubsiteFromTemplate($SiteTitle, $ParentSiteUrl, $TemplateTitle)
{
    #Get the custom site template
    $ParentWeb = Get-SPWeb $ParentSiteUrl
    $SiteTemplates = $ParentWeb.GetAvailableWebTemplates($ParentWeb.Language)

    $CustomSiteTemplate = $SiteTemplates | Where-Object {$_.Title -eq $CustomSiteTemplateTitle}

    #URL for you new subsite
    $SiteUrl = $ParentSiteUrl + $SubsiteURL

    #create subsite without template
    $web  = New-SPWeb -Name $SiteTitle -Url $SiteUrl 

    #Apply the custom site template
    $Web.ApplyWebTemplate($CustomSiteTemplate.Name)

    Write-host "Subsite $($web.Url) has been created from template!"
}

#Call the function to create subsite
Create-SubsiteFromTemplate "Airbus 365 Project" "https://teamsites.crescent.com/projects/"  "PMO Site Template"

#List of sites to be created
$ProjectList = @("Data Tools", "Knowledge Village", "Service Center", "Business Reporting", "JDT Core", "EFI", "Ecore Tools")
$ParentSiteURL ="https://teamsites.crescent.com/projects/"
$SiteTemplateTitle = "PMO Site Template"

#loop through each object in the array and create subsite
foreach($Project in $ProjectList)
{
    #Call the function to create subsite
    Create-SubsiteFromTemplate $project $ParentSiteURL $SiteTemplateTitle    
}