The Clip to Shape feature in Twist allows you to use one shape to clip another shape. The shape being clipped will display through the shape it is being clipped by.
Make sure the shape you are clipping is behind the shape you want to clip.
Select the shape you want to clip
Go to the Object menu and choose Send to back.
Select the shape being clipped and the shape you are using to clip with.
Go to the Object menu and choose Clip to Shape.
The back shape will now be clipped. It will show through the area of the shape that was in front.
You can now work with the clipped shape just like any other object in Twist.
You can remove the clip from the shape at any time. To remove the clip, select the shape, go to the Object menu, and choose Unclip.