In this article, we will see how to create  new managed property in Sharepoint 2013 environment. Below is the sample powershell script to achieve the same.

#Get Search Service Application
$category = Get-SPEnterpriseSearchMetadataCategory –SearchApplication $searchapp –Identity $_.Category

#Get the Crawled Property First
$cprop = Get-SPEnterpriseSearchMetadataCrawledProperty -SearchApplication $searchapp -name $_.CrawledPropertyName -Category $category -ea silentlycontinue

#If the Crawled Property is present
if ($cprop)
{
# Check whether Managed Property already exists

$mproperty = Get-SPEnterpriseSearchMetadataManagedProperty -SearchApplication $searchapp -Identity $_.ManagedPropertyName -ea silentlycontinue
if ($mproperty )
{
Write-Host -f green”Cannot create managed property” $_.ManagedPropertyName “because it already exists”

}
else
{
# If already not there, then create Managed Property
New-SPEnterpriseSearchMetadataManagedProperty -Name $_.ManagedPropertyName -SearchApplication $searchapp -Type $_.Type -Description $_.Description
$mproperty = Get-SPEnterpriseSearchMetadataManagedProperty -SearchApplication $searchapp -Identity $_.ManagedPropertyName

          #Map the Managed Property with the Crawled Property
New-SPEnterpriseSearchMetadataMapping -SearchApplication $searchapp -ManagedProperty $mproperty –                  CrawledProperty  $cprop
}

}

Hope it helps!! Happy Sharepointing 🙂