How can I put a GODOT function inside another function?

Godot 4.3

How can I put a GODOT function (like _ready(), for example) inside another function (any function)?

Could you elaborate on what you are actually trying to do? This smells like an xy problem.

Func custom_func() -> void:
 #process func here (I want to repeat this function using _process

If you want to run custom_func every frame, then you can call it inside of _process, not by putting _process inside of custom_func.

func custom_func() -> void:
    print("custom function")

func _process(delta: float) -> void:
    custom_func()
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