Go to the Warehouse module
Open the Stock sell out summary report
Select a period
Select all warehouses
Click Generate
Cancel the grouping by stock item then group by the warehouse column
The combined results will appear for each warehouse (sales - purchases - sales returns - purchase returns - issue transfer - receive transfer - starting balance - ending balance)
The results can be expand on the items in each warehouse by ungrouping, by clicking on +
Also, with the same steps, it is possible to know the quantities of the rest of the movements, such as purchases, the balance at the beginning of the period, issued and received transfers, and the balance at the end of the period, not just sales.