There is a current feature of being able to "bundle on the fly" within sales orders or invoices, by clicking on "Bundle Items" under the quantity field. However this doesn't work for batch tracked items. However it would be simple to add a dialogue box asking for which batch to bundle. (This somewhat connects to one of the big problems in Zoho Inventory - that every single movement of stock forces you to create a new batch number. This is not how batches work! Food Batches need to stay constant across the whole process, that's the point of batch tracking.)