Auto generate sequential numbering based on value selected in attribute group

Summary:

Hi!

We have requirement to auto generate sequential numbering based on value selected in attribute group.

Example

If i select value in attribute group : 21001 then system will create item coding like 21001000001

Next time i select the same value as in attribute group : 21001 then system will create item coding like 21001000002

Else

If i select value in attribute group : 21002 then system will again start sequential numbering and create item coding like 21002000001

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Version (include the version you are using, if applicable):

24C

Code Snippet (add any code snippets that support your topic, if applicable):