Formula to Return an information within Range

maybe =if(A2<C6,A6,A7)

A2=10002
C6=100100
A6=A
A7=B

To best describe or illustrate your problem you would be better off attaching a dummy workbook. The workbook should contain the same structure and some dummy data of the same type as the type you have in your real workbook - so, if a cell contains numbers & letters in this format abc-123 then that should be reflected in the dummy workbook.

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deleted dupiicate post

Try this..
Simple lookup used...

Formula:

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Here is revised formula...

Formula:

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check the attached file..

If you can swap your table around a little...

	H	I	J
1	START	END	BOOK
2	100001	100100	A
3	100101	100200	B
4	100201	100300	C
5	300001	300100	D
6	200001	200100	E
7	900001	900100	F
8

Then you can use the basic vlookup() for what you want...
B2=VLOOKUP(A2,$H$2:$J$7,3,1)
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