[A] In order to do so, click on Tally Integration >> Ledger Settings
[B] Now scroll down and search Default Tax Ledgers (Input) & Default Tax Ledgers (Output). In here Input is for purchase and output is for sales invoice.
[C] Now select the tax percentage for which you want to add ledger and click on "Edit/Delete", after that a window will slide from right side add ledger name it and click on "Save Details"
Keywords: Add ledger, Tax ledger