You can use either of these strategies to rough cut surfaces:
Areaclear Lace
Here is a simple surface machined with the Z Level Roughing strategy Areaclear:

Here is the same surface machined using Z Level Roughing strategy Lace:

The Z Level cycles allow you to select geometry that limits the extent of the cycle. The geometry limiting the extent of the cycle is called the boundary.
Related Topics
Using Boundaries to Avoid Machining Areas