Customizing naming series

As @Mohammed_Redha said you have to write it in python file (server side).
you can use hooks.py for it.

In hooks.py give an autoname function path for Item.

"Item": {
	   "autoname": "dotted.path.to.autoname.function"
}

Where your method will be like, (In Python file)

def item_autoname(doc, method):
	from frappe.model.naming import make_autoname
	doc.name = make_autoname(doc.item_code + '-.#####')

Hope it resolve your problem.

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