quick question

using spectral layers. [url]picture[/https://imgur.com/a/EKvKxbB]

https://imgur.com/a/EKvKxbB

I have selected at top left. and I want to attenuate all the frequencies in that range. How best to accomplish.
Also suggestion to add the stop and start time shortcuts that cubase has (ctrl 1 start) ctrl num 2 stop.

To attenuate, click Process > Amplitude > Gain.
To delete, press the Delete key.