Mixing tracks.

Dear experts! How can I delete the beginning of the track, from start to cursor, and instead of the remote section put white noise? That is, to make a start - white noise, and everything else is the same as it was. More precisely, replace the beginning by white noise.

Shift + J
“Generate menu > Noise”

Track with white noise is added. How to continue?

Got it. Copy, delete and paste. Question is removed.