I'm 14 years old my vocal range is it may sound crazy for 14 year old but B1 to about C5 I would like to extend my lower range can anyone help?
Why do you want to extend your lower range? If your specs are correct, you already reach lower than basically all Western literature.
That's like a painter who wants to be able to hold an even larger brush. You should focus on actually working with what you have rather than putting it on hold for something else. It's certainly good that you are not lacking in the lower range department, but singing is not a range competition. Even though some make it out to be one.
At least there is less vocal damage to be expected for a young voice hunting for low pitches rather than high ones, but it's still mostly useless in the pursuit of singing well.