Can more than one person stocktake?

Yes.  Any number of people can stocktake and depends on how much stock you are counting and how quickly you want or need to complete the stocktake.  Each person can be assigned a section or isle or category or even time, it depends on how you want to manage them.  It’s important for your software to be able to allocate the stock to be counted by the respective person and for the count to be uploaded to the PC from each of the barcode terminals.