1. Open your Excel file and locate the cells where you want to add the additional information.
2. Click on the cell where you want to add the additional information.
3. Move your cursor to the end of the existing data in the cell.
4. Press the spacebar on your keyboard to create a space.
5. Type in the additional information you want to add to the cell.
6. Press Enter on your keyboard to move to the next cell.
7. Repeat steps 2-6 for all the cells where you want to add additional information.

By following these steps, you can add additional information to your cells without erasing the previous data that you have already entered. This will allow you to update your product information without having to start from scratch.