Scenario
I have 2 tables on the same worksheet. One is for Sales and the second is
for Cost. The common column in both tables is the Sales Invoice Number
column. The tables run into thousand of rows. Both the tables are sorted as
per Sales Invoice Number columns.

Task Information
Cost for certain Sales are missing.

Objective
To find Sales Invoice Details which have missing Cost information.

Current Process
Cut and Paste Cost Table information to match Sales Table based on Invoice
Number column. This process takes weeks to complete one worksheet.

Question
Is there any formula or optional process which can make this task easy.

Conclusion
Since it's a critical report for the management, still I cannot continue to
do in this manner. I might soon loose my eye sight. I am constantly having
headaches. If I don't get a solution, I might consider to resign rather than
continue doing in this manner. Help me guys. Will appreciate from the depth
of my heart.