Importing Transactions from SAP Business One 
Transactions – accounting documents – can be copied from one company to another in SAP Business One. The transactions must first be exported from one company (source), and then imported into another (target).
If a master record for a G/L account or business partner does not exist yet in the target company, the system creates this object automatically, in accordance with the data in the posting.
If importing and exporting transactions are executed on a regular basis, it is advisable to keep a separate, written record of the transactions that were copied during each operation.
Prerequisites
You have backed up the database before starting the import.
If SAP Business One is running on a network, you have ensured that other users are logged off the system during the import.
You have ensured that the master record numbers in the G/L accounts and the business partners that are contained in the postings, are identical in both companies.
Procedure
Log on to the target company.
Choose
Administration 
Data Import/Export Data Import Import Transactions from SAP Business One 
.When the file manager opens, select the export file that has been prepared, and choose Open.
The system imports the data into SAP Business One. After the import operation is complete, a window appears containing any error and warning messages, as well as remarks on the import operation.
Any new master records for G/L accounts or business partners that were added as a result of the import are also listed.
The transactions are added as journal vouchers.
To add the journal vouchers to the permanent journal entries file, choose
Financials Journal Voucher .Select the imported journal vouchers and choose Save.
When the confirmation prompt appears, confirm that you want to save the journal vouchers to the permanent file.