REST API - Pmax 8500 - Link to existing Storage Groups

hi

I have some command rest api works from me Pmax 8500

like 

get Storage Group

get all storageGroups with snapshots

get Snapshots & get Snapshots ID 

create Snapshots 

and more ...

I used this site

https://developer.dell.com/apis/4458/versions/10.1.0/docs/Getting%20Started/1.introduction.md

my problem is, I cannot found information about how I do a Link from snapshot to 
existing Storage Groups 

any help will be grateThanks