To import a custom color palette into Microsoft Excel, you can follow these steps:

1. Open Excel: Launch Microsoft Excel and open a new or existing workbook.

2. Access the Page Layout Tab: Go to the “Page Layout” tab in the ribbon at the top of the window.

3. Select Colors: In the “Themes” group, click on the “Colors” dropdown menu.

4. Create New Theme Colors: At the bottom of the dropdown menu, select “Customize Colors.”

5. Define Your Colors: In the “Create New Theme Colors” dialog box, you will see options to customize colors for various elements (Text/Background, Accents, etc.). Click on each color box to open the color picker.

6. Enter Hex Codes: In the color picker, switch to the “Custom” tab. Here you can enter the hex codes for your desired colors. For the pastel palette we provided:
   • Pastel Blue: #A4C8E1
   • Pastel Green: #B7E1B1
   • Pastel Yellow: #F9EBAF
   • Pastel Pink: #F1B2C1
   • Pastel Lavender: #D4C3E1

   Enter these hex codes into the respective color boxes.

7. Name Your Palette: Give your new theme a name at the top of the dialog.

8. Save and Apply: Click “Save” to apply your new color theme to the workbook.

9. Use the Colors: Now, you can use your custom pastel colors in charts, backgrounds, and text throughout your spreadsheet.

If you have any other questions or need further assistance, feel free to ask!