I receive a list of numbers on an excel sheet and need to match it to info on
another sheet. EXAMP: Book 1, Sheet 1, Col 3 containes the numbers I receive
(6 digit). I need to quickly (and automaticaly, if possible) match the
numbers with numbers on Book 2, sheet 3, Col 4, and add the corresponding
info from Col 6 back to Book 1, sheet 1, Col 4.... next to the original
number.

Any help would be appriciated

You have to use vlookup function.
Searches for a value in the first column of a table array and returns a
value in the same row from another column in the table array.

The V in VLOOKUP stands for vertical. Use VLOOKUP instead of HLOOKUP
when your comparison values are located in a column to the left of the
data that you want to find.
VLOOKUP(lookup_value,table_array,col_index_num,ran ge_lookup)

Lookup_value The value to search in the first column of the table
array (array: Used to build single formulas that produce multiple
results or that operate on a group of arguments that are arranged in
rows and columns. An array range shares a common formula; an array
constant is a group of constants used as an argument.). Lookup_value
can be a value or a reference. If lookup_value is smaller than the
smallest value in the first column of table_array, VLOOKUP returns the
#N/A error value.

Table_array Two or more columns of data. Use a reference to a range or
a range name. The values in the first column of table_array are the
values searched by lookup_value. These values can be text, numbers, or
logical values. Uppercase and lowercase text are equivalent.

Col_index_num The column number in table_array from which the matching
value must be returned. A col_index_num of 1 returns the value in the
first column in table_array; a col_index_num of 2 returns the value in
the second column in table_array, and so on. If col_index_num is:

Less than 1, VLOOKUP returns the #VALUE! error value.
Greater than the number of columns in table_array, VLOOKUP returns the
#REF! error value.
Range_lookup A logical value that specifies whether you want VLOOKUP
to find an exact match or an approximate match:

If TRUE or omitted, an exact or approximate match is returned. If an
exact match is not found, the next largest value that is less than
lookup_value is returned.
The values in the first column of table_array must be placed in
ascending sort order; otherwise, VLOOKUP may not give the correct
value. You can put the values in ascending order by choosing the Sort
command from the Data menu and selecting Ascending. For more
information, see Default sort orders.

If FALSE, VLOOKUP will only find an exact match. In this case, the
values in the first column of table_array do not need to be sorted. If
there are two or more values in the first column of table_array that
match the lookup_value, the first value found is used. If an exact
match is not found, the error value #N/A is returned.




Bruno wrote:
I receive a list of numbers on an excel sheet and need to match it to info on
another sheet. EXAMP: Book 1, Sheet 1, Col 3 containes the numbers I receive
(6 digit). I need to quickly (and automaticaly, if possible) match the
numbers with numbers on Book 2, sheet 3, Col 4, and add the corresponding
info from Col 6 back to Book 1, sheet 1, Col 4.... next to the original
number.

Any help would be appriciated