Working with Edits
As we learned in the Edits article, edits give shape to the model and influence each other based on their mode, color, and order within the edit list. We're going to take a closer look at some of those things in this article.
Adding Edits
To add a new edit, click on one of the primitives in the upper left and drag it into your scene. If you're not already editing the selected model, dragging a new edit in will automatically switch you to edit mode.
You'll notice that this edit now appears in the edit list on the right.
Changing Primitives
Because everything in unbound in non-destructive, you can change an edit's base-primitive at any time. Do this by selecting the edit and then changing the type in the dropdown or by simply right-clicking on one of the shapes in the primitive selector.
Modifying Types
As of this writing, there are 5 types of influence an edit can exert on another edit (or in the case of mirror... itself) Let's go through each one.
Note
Keep in mind that edits exert their effect only on edits ABOVE them in the organizer. You may need to reorder your edits to achieve certain effects. This is discussed more below.
Additive
The most basic and default type is additive. This makes the edit a solid, visible shape that adds volume to the model. Both the edits in the above examples are additive.
Subtractive
Subtractive edits do not display in your scene. Instead they carve their shape from other edits in their model. When selected they will show as a wireframe. Adjusting the blend property will determine how sharply or softly a subtractive edit removes volume from another edit.

Crop
Crop is similar to subtractive mode but instead of carving out from affected edits you'll instead get the intersection of the edits. Here you can see a cube being influenced by a sphere set to crop, which leaves only the portion of the sphere that overlaps the cube.
For more information on crop mode, check out the 1 minute quick tip.
Paint
Paint will not show itself in the scene. Instead, it will apply its own color onto models within its range of influence.
In this example you can see how the edit disappears when it switches to paint mode. The color, once changed, shows as a hard intersection with the cube until the blend is turned up, softening its influence on the cube.
Every edit, whether in paint mode or not, can have its own color. Subtractive edits paint the inner cavity of the model they carved into
Mirror
This mode will duplicate itself along the y-axis. When using this, you'll need be aware of an edit's position relative to the model's origin.
This is handy for sculpting symmetry, faces, windows on either side of a door, a repeating ornamental frame. In this example, you can see a harness that was modeled using the mirror modifier. As one half moves away from the y-axis so does its counterpart.