> For the complete documentation index, see [llms.txt](https://wpahelp.windhamlabs.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wpahelp.windhamlabs.com/custom-time-series-excel-add-in.md).

# Custom Time Series Excel Add-in

**Installation for Excel 2007**

1. Locate the following file:
2. Open Microsoft Excel 2007.
3. Select Excel Options from the Office Button in the upper left corner of the screen.
4. Select the Add-ins option.
5. After selecting “Add-ins,” hit “Go.”
6. Browse for and select: C:\Program Files\Windham Capital Management, LLC\WPA 3.0\WPA 30 Upload Data.xlam
7. Affirm any subsequent prompts related installing this add-in
8. Once the add-in is installed, you should see a “Windham” item in Excel’s Add-ins menu bar.

**Installation for Excel 2010 or later**

1. Open Microsoft Excel 2010 or later
2. Select File from the Ribbon in the upper left corner of the screen.
3. Select Options
4. After selecting “Add-ins,” hit “Go.”
5. Browse for and select: C:\Program Files\Windham Capital Management, LLC\WPA 3.0\WPA 30 Upload Data.xlam
6. Affirm any subsequent prompts related installing this add-in
7. Once the add-in is installed, you should see a “Windham” item in Excel’s “Add-ins” menu bar.

Once installed, use the “Load time series” menu item in Excel to create a new custom database. You may also refer to the built-in help menu item for an example on how to proceed with the process.