How To Sort In Grouping

I want to be able to sort product inventory information. The report generated for me shows on-hand inventory for each product in each warehouse (there are many rows in the spreadsheet per product - i.e. each product/warehouse combination has its own row).

I'd like to sort the table based on most total inventory per product, but maintain the products in their groupings. I know I could do a pivot table and sort it - the problem is, I want to able to see the warehouse distribution for each total. A pivot table would just give me the overall total without the breakdown per warehouse.

Here's an example:

Product #
Warehouse
Inventory

547
100
628

[Code] .......

From this, total inventory for product 547 is 694 units. For product 2091 it's 2,153 units. For product 1165 it's 286 units.
Therefore, I'd like the 2091 grouping to come first (all of it - including the rows showing 0 inventory), followed by the 547 grouping, followed by 1165 grouping.