How to make an ID that will increment with every entry?

I’m trying to do unique ID for every entry in the table that will have certain prefix.
There will be an ID of an company and then I need to add unique ID of an job to that. Let’s say we have company ID 12345 and we have multiple jobs starting 01 and ending 99 so I need to have the correct ID for the job.
(1234501, 1234502 etc.)
Any idea?
Thank you. Aleš

see the section in the documentation for the number series.
Number Series - Tabidoo Help Center.

With Regards,