Welcome to the awesome monday.com community.
Yes, each pulse on a high-level board can create a down-level board from a template. This down-level board is linked to that pulse. If you trigger the down-level board creation from another pulse that pulse will be connected to the second down-level board and so on. There are recipes to aggregate data from supported column types. As an example this is the recipe to create down-level boards (in this case it create a Main board):
Then there are recipes like:
The last recipe will show for each connected down-level board how many statuses in the down-level board are set to Done. It also supports percentages but unfortunately there is now way to create the famous battery bar as there is no API support for this.
More info (including detailed document and video) can be found at: 20|Rollup Multiple Boards - Excellent Team
I work very closely together with the Swedish partner Omnitas (@Thomas-Omnitas) which are experts in implementing monday.com and apps developed by Excellent Team.