newbie-X Studio- creating silence within a track?

How do you do this? I'm used to Audacity where you highlight a track and hit the "silence" button and that section of a track is silent. I only see "remove silence" in X studio. If I hit delete, it works but cuts the track in two. Must be a simple fix I bet?

Here's another option.

1. Position the Smart Tool in the top half of hte clip, and drag across the area where you want silence.
2. Go Process > Apply Effect > Gain. Turn all the Gain sliders to zero and click on OK.

My preference is generally to split the audio clip and then just slip edit the start and end points. This is particularly good on vocal tracks, as it gives a nice visual representation of whats going on. I usually only split the audio at points where there is a significant gap - like in between each line of the verse or chorus, for example. Nothing wrong with the other options either. There are lots of ways to get things done in Sonar. The nice thing about slip editing is that it is non destructive. You can move the start and end points of the clip at any time if you want to, as all of the original audio is still accessible.

Mute tool