Forgot How to Insert an Audio on a Track

I know I have done in the past where I inserted an addition piece of audio into an existing track, but can not remember how to do it/
Thank you for any help

It is unclear if you want to import audio, or cut-and-paste audio into a track.

Have look at the manual:

Under Audacity Foundations, read the section on Importing Audio.

Read the relevant sections under Editing with Audacity.

– Bill

Sorry I wasn’t clear.
I want to add a section of Audio in a track.
I have done it in the past but can’t remember how.
Thank you for your help.