You would not lose any data by creating a new business. The data would be duplicated in the new business.[quote=“Sagar, post:4, topic:5214”]
I have total 2000+ sales invoices so I want delete all invoices at a time because I want My Customer list 100+ customers and Sales Invoice Items
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With 100 or so customer and/or sales invoice items, it would be faster to rebuild those lists than delete 2000 invoices. You could use the export and batch functions for some of that work. Even if all data did not come over, filling in the missing information in a spreadsheet before a batch update, or editing the customers and sales invoice items afterwards would still be faster than deleting 2000 sales invoices and all their dependent transactions. Also see the answer to your other question at How to Backup only Customer list in New Business - #4 by Sagar.