Yes, collections of brushes can be grouped together.
If the brushes are all of the same kind, say, Oil Brushes for example, you can make a new Preset Group in the Presets panel and stored them there.
But if the brushes you want to collect together are of different kinds, then Toolboxes in AR will facilitate this.
And not just brushes can be stored in Toolboxes! For more info about what can be stored in Toolboxes see here: https://www.artrage.com/manuals/gett...and-workbench/
One thing to note though about Toolboxes is that they do not actually contain any assets. They are more like a fetch list telling AR where and what to get you.
If an asset is moved or renamed after being added to a Toolbox, you will get an error message when trying to access that asset from the Toolbox containing it.