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This is not possible, you know the ticket number form and there only one number is managed for each form.
Via DSO you could create a prefix for each customer, but the numbers remain general.
2 of 2 people found this helpful
I would suggest do not alter any OOTB ticket id fields as they are used in lots of places for creating parent child relationships.
One thing you can do is maintain your own company specific ticket counters via custom code and using that generate a custom ticket id field value which you can show to customers. This custom field you can also show on SmartIT via UI configuration feature of SmartIT.