How we can generate serial no. according to model number and current year(Production order)?

ERPNext
1

On submission of production entry for manufacturing item, system will automatically generate Serial Nos.
We need customization for serial no.

Serial No = model number + current year

2

This is a good start vabhavk

https://erpnext.org/docs/user/manual/en/setting-up/settings/naming-series?