The easiest way of comprehending something is always looking at HOW it works. Create a favorite and look at the XML in the catalog:

<?xml version="1.0" encoding="UTF-8"?><favoritelist xmlns="com.siebel.analytics.web/favorites/v1">  <favorite name="Customers Details" catalogpath="/shared/01. QuickStart/Simple Demo Dashboard/Customers/Customers Details" type="catalogitem" /></favoritelist>

However if you look at where this is stored you'll see this:

So a system folder called _favorites UNDER a system folder called _internals. And if over the years one has learned one thing about the OBI web catalog then it is that one doesn't mess with system folders unless one knows exactly how what works why.

Let's fake an entry:

Does it show? Nope:

type="catalogitem" declares an analysis and the path points to a folder, so that's just wrong.

tl;dr - no. Favorites are for analyses.

PS: Not to make too fine a point and don't take this the wrong way. This is the internet after all and everybody can be anything they want - but signing "Xavier" while keeping 932245 as your name? Take a cue from all leaders of the BI community:

Use your actual name.

Category is just to make folders of favorites - i.e. group favorites:

So my statement remains, @932245 - it's only analyses and other "items". Never folders.