To do this, first create a new, blank component frame. Then, select the assets panel on the left. You can drop an instance of each of your local components from here into the new component frame. Alternatively, you can copy and paste instances of each component set into the component frame.
The assets panel in Figma.
When you go back to the layers panel, you should see empty triangle markers to the left of each component layer. Don’t worry that only one trait is showing - the Bueno exporter will export all variations of each component.
Instances of each component group in a parent component frame.