This is done what is already in place. in the project there are several bundles (for the other functions the software understands these subsets well) for example for the BOMs, I have no problem.
I manage to get the list of equipment out of bundles, but for the cables everything is grouped together.
I just looked into your concern. Indeed, you can't separate the cables by bundle (or I don't have the trick either).
On the other hand, I can offer you a solution to sort these cables. Instead of making bundles, try to make localizations for your cabinets. It is much easier to sort the material or cable references by the.
In BOM configurations, you can even add sort columns and make breaks. This will separate the items for you as you wish.
I hope this will help you, even if I'm coming a little late...