Save-ContentTypeMapping

# Connect to the source and destination sites
$srcSite = Connect-Site -Url "http://myfarm1/sites/mysourcesite"
$dstSite = Connect-Site -Url "http://myfarm1/sites/mydestinationsite"

# Retrieve the source list from the source site
$srcList = Get-List -Name mysrclist -Site $srcSite

# Retrieve the destination list from the destination site
$dstList = Get-List -Name mydstlist -Site $dstSite

# Retrieve existing content type mappings between the source and destination lists
$mappingSettings = Get-ContentTypeMapping -SourceList $srcList -DestinationList $dstList

# Display the retrieved content type mappings
$mappingSettings

# Example initial output:
# PropertyMappings         : 
# ContentTypeMappings      : Audio                  -> Audio
#                            Basic Page             -> <NO DESTINATION>
#                            Document               -> Document
#                            Folder                 -> Folder
#                            Image                  -> <NO DESTINATION>
#                            Video                  -> <NO DESTINATION>  
# UserAndGroupMappings     : 
# PermissionLevelMappings  : 
# SiteTemplateMappings     :  
# SensitivityLabelMappings :

# Add a content type mapping from "Image" to "Picture"
$mappingSettings = Set-ContentTypeMapping -MappingSettings $mappingSettings -Source Image -Destination Picture

# Add a content type mapping from "Video" to "Movie"
$mappingSettings = Set-ContentTypeMapping -MappingSettings $mappingSettings -Source Video -Destination Movie

# Add a content type mapping for "My Custom Content Type" to ignore its destination
$mappingSettings = Set-ContentTypeMapping -MappingSettings $mappingSettings -Source "My Custom Content Type" -Ignore

# Save the updated content type mappings to the source and destination lists
$mappingSettings = Save-ContentTypeMapping -SourceList $srcList -DestinationList $dstList -MappingSettings $mappingSettings

# Retrieve the updated content type mappings to confirm changes
$mappingSettings = Get-ContentTypeMapping -SourceList $srcList -DestinationList $dstList

# Display the updated content type mappings
$mappingSettings

# Example updated output:
# PropertyMappings         : 
# ContentTypeMappings      : Audio                  -> Audio
#                            Basic Page             -> <NO DESTINATION>
#                            Document               -> Document
#                            Folder                 -> Folder
#                            Image                  -> Picture
#                            My Custom Content Type -> <NO DESTINATION>
#                            Video                  -> Movie  
# UserAndGroupMappings     : 
# PermissionLevelMappings  : 
# SiteTemplateMappings     :
# SensitivityLabelMappings :

# Connect to the destination site
$dstSite = Connect-Site -Url http://myfarm1/sites/mydestinationsite

# Retrieve the destination list from the destination site
$dstList = Get-List -Name mydstlist -Site $dstSite

# Retrieve existing content type mappings from the file system for the destination list
$mappingSettings = Get-ContentTypeMapping -FromFileSystem -DestinationList $dstList

# Display the retrieved content type mappings
$mappingSettings

# Example initial output:
# PropertyMappings         : 
# ContentTypeMappings      : <File>   -> Document
#                            <Folder> -> Folder  
# UserAndGroupMappings     : 
# PermissionLevelMappings  : 
# SiteTemplateMappings     :  
# SensitivityLabelMappings :

# Update the content type mapping for files from the file system to map to "Picture"
$mappingSettings = Set-ContentTypeMapping -MappingSettings $mappingSettings -FileFromFileSystem -Destination Picture

# Update the content type mapping for folders from the file system to map to "Document Set"
$mappingSettings = Set-ContentTypeMapping -MappingSettings $mappingSettings -FolderFromFileSystem -Destination "Document Set"

# Save the updated content type mappings back to the destination list
$mappingSettings = Save-ContentTypeMapping -FromFileSystem -DestinationList $dstList -MappingSettings $mappingSettings

# Retrieve the updated content type mappings to confirm changes
$mappingSettings = Get-ContentTypeMapping -FromFileSystem -DestinationList $dstList

# Display the updated content type mappings
$mappingSettings

# Example updated output:
# PropertyMappings         : 
# ContentTypeMappings      : <File>   -> Picture
#                            <Folder> -> Document Set  
# UserAndGroupMappings     : 
# PermissionLevelMappings  : 
# SiteTemplateMappings     :
# SensitivityLabelMappings :

Save-ContentTypeMapping
-MappingSettings <MappingSettings>
-SourceList <List>
-DestinationList <List>

Save-ContentTypeMapping
-MappingSettings <MappingSettings>
-FromFileSystem <SwitchParameter>
-DestinationList <List>