Quote Originally Posted by Lemice View Post
You can try this formula then
=LOOKUP(2,1/(A2>=BB!$A$2:$A$17)/(A2<=BB!$B$2:$B$17),BB!$C$2:$C$17)
Enter it as normal. You don't have to enter it as array.

And also you should make a helper column to "erase" the #N/A instead of putting it into an ISERROR, because it will just make the formula calculating twice.
Thanks. I shall try it. Please note, the numbers of entry in BB sheet will increases day by day and it may go upto row 65000.