Recommended test
Split a box face with a line and cut one resulting region.
- Apply a Box in the current Custom Solid workspace.
- In 3D mode choose Line, click a flat face and draw across it from one boundary edge to another.
- Choose Push/Pull, select one region and set Subtract with a short inward distance.
- Fix the distance, review and Apply; save and reopen to check the sketch and body.
Start on a flat face
Apply the solid first. In 3D mode, choose Rectangle, Circle, Line, Arc, Spline or Guide and click a flat face of a current Custom Solid body. The camera stays in place and the body remains visible while you draw.
Box faces, flat extrusion faces, cylinder end caps and pocket floors can provide a sketch plane. Curved cylinder walls and other curved surfaces cannot. Orbit until the receiving face is easy to pick.
For an aligned drawing view or a profile away from a body, use Sketch mode and work planes.
Draw the region you need
Draw a closed outline inside the face for a pocket or boss. An open line, arc or spline can also divide the face if it crosses the boundary: the existing face edges complete the selectable regions. A short open stroke floating inside the face does not enclose a region by itself.
Use snaps to reach the face boundary, then inspect the highlighted region. Keep construction geometry out of the cutting outline. Lines and curves use the same editing controls as ordinary plane sketches.
Add or remove material
Choose Push/Pull and click the intended region. A face sketch initially suggests Join on the picked body. To make a pocket, switch to Subtract and move or enter a distance into the body.
A visible closed sketch on a saved face plane takes priority over the body face behind it. If you need a specific profile, choose it in the Profile dropdown. Show the sketch in the browser and finish its drawing gesture before selecting it. For the whole face, pick outside the sketch region or hide the sketch first.
For a detail held along one straight boundary edge, select the sketch region and choose Motion > Tilt or Wedge.
The outline tracks the pointer immediately. Click again to fix the distance and calculate the exact result, then Apply. Check the opposite side for a through-cut. See Push/Pull for precise mouse control and whole-face offsets.
Keep the source sketch
Cancel leaves the body unchanged and keeps the drawing. Finish sketch also saves the drawing without changing the solid. Its reference plane starts hidden and can be shown in the browser.
The sketch and face support survive saving and reopening. They stay at their saved positions: moving the body or editing its faces does not carry the source sketch along or replay previous features. Recheck placement before using the sketch for another operation.