SPE script: Copy Items

 Copy items

$newCategories = Get-ChildItem "/sitecore/Site1/Home" | Where-Object -Property TemplateName -eq "Category"

$source = '/sitecore/content/Site1/Articles'
$target = '/sitecore/content/Site2/Articles'

$targetItem = Get-Item $target
$allItems = Get-ChildItem $source

$healthTopicImageFolder = Get-Item "/sitecore/media library/Site1/Articles"

$allItems | ForEach-Object {
 $newItem = $_.CopyTo($targetItem, $_.Name)
 $newItem.Editing.BeginEdit();
 
 # Reset Page design
 $newItem["Page Design"] = "";

 # Replace category if possible
 $categoryItem = Get-Item $newItem["Category"]
 IF ($categoryItem) {
  $newCategoryItem = $newCategories | Where-Object -Property Name -eq $categoryItem.Name
  IF ($newCategoryItem) {
   $newItem["Category"] = $newCategoryItem.ID;
  }
 } 
 
 # Hero Image
 $oldImage = [Sitecore.Data.Fields.ImageField]$newItem.Fields["Image"];
 $newImage
 if ($oldImage) {
  $newImage = $oldImage.MediaItem.CopyTo($healthTopicImageFolder, $oldImage.MediaItem.Name);
  $oldImage.MediaID = $newImage.ID;
 }

 # Thumbnail
 $oldThumbnailImage = [Sitecore.Data.Fields.ImageField]$newItem.Fields["ListingThumbnail"];
 if ($oldThumbnailImage) {
  if ($oldThumbnailImage.ID -eq $oldImage.ID) {
   $oldThumbnailImage.MediaID = $newImage.ID;
  }
  else {
   $newThumbnail = $oldThumbnailImage.MediaItem.CopyTo($healthTopicImageFolder, $oldThumbnailImage.MediaItem.Name);
   $oldThumbnailImage.MediaID = $newThumbnail.ID;
  }
 }
 
 $newItem.Editing.AcceptChanges();
}