Hi,
So, first, you should configure the order / invoice number formats.
For the order number format, set it to {order_id}
For the invoice number format, set it to {order_invoice_id}
Then, if you want the next order number to be 100, you need to set the auto_increment value of the hikashop_order table to 100 in your PHPMyAdmin:
www.hikashop.com/forum/orders-management...et-order-number.html
For the invoice number, if you want the next number to be 50 you need to open the hikashop_order table in your PHPMyAdmin, edit an old order, and change the order_invoice_id to be 49.