Yes, you can upload your already prepared financial statements in Excel format into Odoo accounting. Odoo accounting has a feature that allows you to import data from Excel spreadsheets.

To do this, you can follow these steps:

1. Prepare your financial statements in Excel format. Ensure that the columns and rows are properly formatted and organized.

2. Log in to your Odoo account and go to the accounting module.

3. Click on the "Import" button at the top of the page.

4. Select the Excel file that you want to import and follow the instructions on the screen.

5. Map the columns in your Excel file to the corresponding fields in Odoo accounting.

6. Review and confirm the data that you are importing.

7. Click on "Import" to upload your financial statements into Odoo accounting.

It is important to note that importing financial statements from Excel into Odoo accounting may not be a straightforward process, and you may need to make adjustments and corrections to ensure that the data is accurately reflected in your consolidated financial statements. You may want to consult with an accountant or financial expert to ensure that your financial statements are correctly consolidated in Odoo accounting.