Auto Assign number from values selected from a combo box

[natyboi]

Hi guys. i have a little problem here.
I have a combo box with values like Japan, China, Philippines and i want ms access to assign auto number in every values that i choose. Any help out there?

for example :

i choose Japan from the combo box then the text box will give an auto number.

help please!

[zmbd]

How is this substantially different than what you have already asked for in: http://bytes.com/topic/access/answer...-choose-combox

Is this not the same issue as the compound lot/serial/sequence number that you asked therein?

If not, then you have alot of missing information whithout which we simply can not answer your question.