PowerShell script to create a new User Profile Property

  #Load SharePoint User Profile assemblies

 [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.Office.Server")

 [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.Office.Server.UserProfiles")

 #Function to get service context

 function Get-SPServiceContext([Microsoft.SharePoint.Administration.SPServiceApplication]

  $profileApp)

 {

  $profileApp = @(Get-SPServiceApplication | ? 

  {$_.TypeName -eq "User Profile Service Application"})[0]

return [Microsoft.SharePoint.SPServiceContext]::GetContext

($profileApp.ServiceApplicationProxyGroup,

[Microsoft.SharePoint.SPSiteSubscriptionIdentifier]::Default)

 }

 #Get UserProfileManager 

 $serviceContext = Get-SPServiceContext

 $userProfileConfigManager = New-Object Microsoft.Office.Server.UserProfiles.

  UserProfileConfigManager($serviceContext)

 $userProfilePropertyManager = $userProfileConfigManager.ProfilePropertyManager

 $userProfilePropertyManager = $userProfilePropertyManager.GetCoreProperties()

$userProfileTypeProperties = $userProfilePropertyManager.GetProfileTypeProperties

([Microsoft.Office.Server.UserProfiles.ProfileType]::User)

 $userProfileSubTypeManager = [Microsoft.Office.Server.UserProfiles.

  ProfileSubTypeManager]::Get($serviceContext)

$userProfile = $userProfileSubTypeManager.GetProfileSubtype

([Microsoft.Office.Server.UserProfiles.ProfileSubtypeManager]::GetDefaultProfileName

([Microsoft.Office.Server.UserProfiles.ProfileType]::User))

 $userProfileProperties = $userProfile.Properties 

 #Set Custom Property values

 $PropertyName = "MyProperty"

 $PropertyDisplayName = "MyCustomProperty" 

 $Privacy="private"

 $PrivacyPolicy="mandatory"

 $coreProperty = $userProfilePropertyManager.Create($false)

 $coreProperty.Name = $PropertyName

 $coreProperty.DisplayName = $PropertyDisplayName

 $coreProperty.Type = "string"

 $coreProperty.Length = "50"

 #Add Custom Property

 $userProfilePropertyManager.Add($coreProperty)

 $profileTypeProperty = $userProfileTypeProperties.Create($coreProperty)

 #Display Settings

 #Show on the Edit Details page

 $profileTypeProperty.IsVisibleOnEditor = $true

 #Show in the profile properties section of the user's profile page

 $profileTypeProperty.IsVisibleOnViewer = $true

 #Show updates to the property in newsfeed

 $profileTypeProperty.IsEventLog = $true

 $userProfileTypeProperties.Add($profileTypeProperty)

 $profileSubTypeProperty = $userProfileProperties.Create($profileTypeProperty)

 $profileSubTypeProperty.DefaultPrivacy =[Microsoft.Office.Server.UserProfiles.Privacy]

  ::$Privacy

$profileSubTypeProperty.PrivacyPolicy =

[Microsoft.Office.Server.UserProfiles.PrivacyPolicy]::$PrivacyPolicy

 $userProfileProperties.Add($profileSubTypeProperty)

 #Add New Mapping for synchronization user profile data

 #SharePoint Synchronization connection

 $connectionName ="connectionname"

 #Attribute name in FIM/LDAP source

 $attributeName ="attributename"

 $synchConnection = $userProfileConfigManager.ConnectionManager[$connectionName]

 $synchConnection.PropertyMapping.AddNewMapping

 ([Microsoft.Office.Server.UserProfiles.ProfileType]::User,$PropertyName,$attributeName)

 Privacy is an Enum, which has these values,

PrivacyPolicy is an Enum, which has these values,

Setting Core Properties - https://msdn.microsoft.com/en-us/library/ee578663.aspx

Add New Mapping - https://msdn.microsoft.com/en-us/library/microsoft.office.server.userprofiles.propertymapcollection.addnewmapping.aspx