template for creating Activity ID format

Hi All

this is my first query in the site and in forum, so forgive me if i'm talking about old issue

i need an example for a template for creating Activity ID like (activity No. 00000000000000)

- first 4 digits for Project

- second 2 digits for phase.

- third .......

and so on, can i find any example for one template like this to adjust my requirements on the same template?

thank you

Ahmed