You can add pie charts by using the insertion function of PPT. Please refer to the following steps for specific operations.

1. Open a PPT file with WPS on your computer, and click the Chart option in the Insert tab of the menu bar.

2. Then click Pie Chart in the Insert Chart dialog box.

3. Then click the "Chart Tool" option in the menu bar and click "Select Data" on its page.

4. Next, you will jump to the table data source, set the data as needed, and then click OK to close the table and return to the slide.

5. After completing the above settings, you can add pie charts to ppt.