Hi,
To utilize the copying feature in WavePad, follow these steps: select the desired portion of the recording, right-click, and choose the "Copy" option. Then, press Ctrl+N on your keyboard to create a new tab, and proceed to paste the copied section into this new tab. Consequently, only the copied portion will be present in the newly created tab. After that, right-click on the chosen recording and select the "Mix in MixPad" option. By following these steps, you should achieve the desired outcome.