Once you connect certain companies, you can observe that AccXchange is fetching newly entered cash and bank vouchers and listing them in Payment Vouchers Outbox and sales invoices in Sales Invoice Outbox. In the similar manner, you will start to receive vouchers and your purchases bills when the relevant connected parties enter them in their books of accounts maintained in Tally.

The steps involved in exchanging Vouchers & Invoices in Tally are explained- Click Here