Unable to bulk assign pre assigned serial numbers during work order completion

Summary:

steps performed:

1. item with lot attribute as dynamically generate and serial number as preassigned.

2. generate preassigned serial numbers

3. use the item for a process manufacturing work order where primary output quantity is 100

4. Release the work order and arrive at last step to issue out the 100 quantity of primary output

5. generate lot numbers in a single go by selecting all 100 rows and clicking on generate lot

requirement:

should be able to assign already generated serial number in a single go rather than going through each row and assigning 100 serial numbers manually. Manually assigning serial number is a very tiring activity when there is huge quantity in the work order.