How to take backup and restore subsite and list using powershell

Example for Subsite backup and restore:

Export-SPWeb -Identity http://spsdemo:9999/Subsite1 -Path "D:\Exports\Subsite1"
Import-SPWeb http://spsdemo:6666/Subsite2 -Path "D:\Exports\Subsite1.cmp"

Example for list backup and restore:

Export-SPWeb http://spsdemo:9999/ -ItemUrl "/Lists/Test%20docs/" -Path "D:\Exports\TestDoc"
Import-SPWeb -Identity http://spsdemo:6666 -Path "D:\Exports\TestDoc.cmp"