Is there any solution or module to set a barcode per outer packaging.

Let's say I have a product with an EAN. In wholesale this product can be bought in trays of 6 pcs. Is there any solution I could define that scanning this outer barcode would immediately count 6 picked pieces?

At the moment if we sell 7 pcs. of a product we need to open the tray and scan 6 products plus the one. Using the outer barcode we would only need to scan 2 times.

I already looked into UoM but there is no possibility in my opinion to set a outer barcode.