Subqueries

Hi,

I’m busy writing REST calls using API v1 to import data directly to Excel using the REST Call.

I noticed when accessing the “tracker”  page for a user on the community the REST call in the around (using Fiddler) looks something like this (raw text view)

select:[{field:categories,expand:{select:[id,title,view_href,parent_category.id],from:categories,where:[{field:hidden,operand:=,value:false}],orderBy:{field😛osition,direction:ASC},limit:1000}},{field😛oards,expand:{select:[id,title,view_href,conversation_style,parent_category.id],from😛oards…

In seeing this I would like to know id it possible to use subqueries in a LiQL query?
Looking at above it seems that Lithium is doing it.

If so, is there any documentation available

Thanks