You can merge multiple product counts, limited to those product counts that are drafts. Once a product count is saved and locked, it can no longer be merged with other counts.
Log in to the administration panel. Go to Logistics > Item Count. Select multiple product counts and click the Merge button.
A new product count will now be created with the content from all selected product counts. Note that this will be a new product count, and the selected product counts may need to be deleted (not locked!).
If the same product is in several of the product counts, the quantity will be added together. For example, 1 productin the first product count and 3 product in the second product count will give 4 products.