Select the torso object if it is not already selected.
In the modifier stak display, the Editable Poly hierarchy should still be expanded.
In the modifier stak display, clik Editable Poly > Edge.
This moves you bak to the base-object level, and you see the low-resolution versión of the model before MeshSmooth takes effect.
As you move the cursor after the first click, a line dynamically shows you where QuickSlice will create new edges.
Press CTRL+Z to undo the QuickSlice, and then clik Slice Plane.
The Slice Plane gizmo appears where the QuickSlice was.
If necessary, move and rotate the gizmo so it's positioned as shown in the following illustration.
You might need to toggle the Show End Result On/Off Toggle button to the off state in order to see the low-resolution versión.
In the Edit Geometry rollout, clik the Slice Plane button.
The Slice Plane gizmo appears as an orange wireframe square on the torso model representing the slicing plane.
The Slice Plane tool uses a square gizmo to define a 2D cutting plane. Where this plane intersects your model, the model is cut or divided and new edges and vértices appear. It’s important to note that the cutting plane defined by the gizmo extends infinitely in all directions. Even if the gizmo is small, it will still cut through your entire model.
In its default position, the gizmo is horizontal through the object center, but you'll be making a vertical cut. You could rotate and move the gizmo into place, but it's easier to do the initial setup with the QuickSlice tool. Then you'll use Slice Plane to make the actual slice.
Turn off Slice Plane, and then clik QuickSlice.
In the Left viewport, using the illustration below as a guide, clik once below the box, move the cursor above the box, and then clik again.