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   void ConstantOnHeld()
    {
        if (Input.GetKeyDown("Whatever"))
        {
            //On Down Event
        }
        else if (Input.GetKey("Whatever"))
        {
            //On Held Every Frame
        }
    }



    bool HeldCheck;
    void OnceOnHeld()
    {
        if(Input.GetKeyDown("Whatever"))
        {
            HeldCheck = false;
            //On Down Event
        }
        else if(!HeldCheck && Input.GetKey("Whatever"))
        {
            HeldCheck = true;
            //On Held Initially
        }
    }