to link sales order/line number to discrete job.

After creating a discrete job for a sales order there is an option on form to link sale/order line number to that job, so we need to  select from LOVs

for correct order line number to attach to that job but the issue is that only one line number is visible in LOVs, so it is impossible to link job to order line number,

Please tell how to get all line numbers in LOV?