They have blank strap leather. I don't know if they do leather work. They are really helpful and have lots of leather options. It's worth at least calling.
Tandy sells the supplies for leather working. They don't do the work however. They might be able to put you in touch with someone that does leather work but that is not a service they normally provide.
They don't. They sell leather and may be able to recommend someone.
Thanks! Your answer is awaiting moderation.