Go to Gateway of Tally ➞ Statutory Reports ➞ GST ➞ Update Party GSTIN
Select Name of Group: All Items, Name of Ledger: All Items
Click on Show All button (on the right) to make sure all records are shown on screen
Click on Export button (on the top), Select Excel export file format
This will export all the contacts to an Excel file. Although the format of this file is different than Octa import format, it is very easy to convert this file. To import the contacts in Octa, go to Contacts page and click on Import button. Click on Get Sample File button to download the sample file accepted by Octa.