1. Vendor is not registered earlier and there are some transactions created for this vendor and after some time vendor will get registered, then how to track tax for this vendor ?
User has to create two seprate vendors, one is registerd and second is unregisterd. If he updated the unregisterd vendor in to registerd vendor then GSTR-3B will show according to current status of vendor.
Yes, you can import your Ledger/Customer/Party/Supplier data.
For any technical assistance, please contact our support team. Our team contact no is also mentioned in the accounting panel.