To copy the transactions to one book to another, you can use Bkper add-on for Google Sheets.
- Open the book you'd like to copy the transactions.
- At the right top of the screen, click the ⚙️gear icon to open the Settings menu.
- Click 'Make a Copy'.
- Open Bkper Add-on for Google Sheets to fetch all your transactions from your old book into a Google Sheet.
- Record all the transactions with the same Bkper Add-on Google Sheets into the New Book.