Google Driive calc - Assign correlative numbers 1, 2, to a equal codes

Hi,

I would like to know if ther is any formula to automatically assign the same correlative number to equal or repetitive codes.

For column  ORDEN is there any  formula to assing the same number to ORDEN for each equal Ordernumber as in this example?
That is ORDEN 1 for all repetied order 200001195
ORDEN 2 for all repeted order 200001198

ORDEN      Ordernumber
1      200001195
1      200001195
1      200001195
2      200001198
2      200001198
3      100005020
3      100005020
3      100005020
3      100005020

Thanks again
apocalip30Asked:
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Rgonzo1971Connect With a Mentor Commented:
Hi,

Pls enter a 1 at line 2
at line 3 this formula
=IF(B3=B2;A2;A2+1)

Open in new window

and fill down

Regards
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apocalip30Author Commented:
Thanks !!
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xtermieCommented:
If these are not in sequence the formula above will not work.
It would be preferable to put unique ORDEN and Ordernumber combinations into a separate sheet and use a vlookup statement to fill in the ORDEN based on exiting Ordernumber values in that lookup sheet.
If there is no such number, the next number will be automatically assigned.
However, in this case do not forget to add the new unique ORDEN and Ordernumber combination to the lookup sheet and update the lookup reference in the formula

Check the example I've attached.
Example_Orden.xlsx
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