Multiple sale invoice delete

How delete multiple sales invoices , qoute in one click.

There is no bulk delete for sales invoices or sales quotes.

Why would you need to delete these in batches?

i want to shift my Custmors & Inventories to other business and some setting as well.
so why i need it

customers and inventories can be batch created and updated to the new business.

How to ???

read the guide.