Using Powershell to upload xml

Hi All,

I have sharepoint 2013 site in that site i activated visual sp help system feature.Then iam going to site settings page in that visual help settings  i am clicking on manage visual help items link in that link page in the ribbon iam clicking on import help items and select the xml  configuration file  and click on import then the documents are added in this page(page url like https://abcdes.org/abc/_layouts/15/xyz.sp/Manageitemss.aspx.).So the requirement is need to do this activity using powershell.There is so many site collections so i need to do this using powershell.

Thanks in advance.

Regards,

Praveen