tying shop order to cust order

version 6.1

we occasionally take customer orders where the item numbers on the
order lines are identical. (ie ship one of these per month for the next
10 months)

we custom build each line so we cut a separate work order for each
line, (one per month). when we cut the work order we specify the
customer order it is for. 

i can tie the shop order to the customer order on customer order and
part number. this works except when we have multiple lines of the same
part number on the same order. is there any way to specify on the work
order the customer order and customer order line that the work order is
for? or is there a way to update the ECL record to specify what shop
order was cut for this specific line?

chick doe
prime measurement products