Step 1. By default, all cases will have Planes through where the lid and base meet.

Step 2. There are 3 planes, 2 of which so the the edge of the base and lid sections with a single plane running through there the aluminium section meet together.

Step 3. To give a brief explanation of what a work plane is, a work plane is a section of work area that has a 0 value in terms of its thickness and acts as a reference plane. Work planes allow elements to snap to that determined space occupied by the work plane.

Step 4. Internally you can use work planes to place things such as dividers, foam blocks and hardware accurately inside your case.

Step 5. Externally work planes are used on the castor boards to locate your castors.

Step 6. The work plane tool has 3 main tools for locating your work plane which are:

Plane: Single left clicking a face will create a work plane directly on to said plane. Click and holding, while moving the mouse will offset the work plane from the face, you can either drag the face with the mouse or put a dimension in the box that has appeared. Once happy with the work plane's location then click the Green tick to confirm the location or the Red cross to cancel the operation.

Offset from plane: Click on the face you want the work plane to be offset from, this will offset the work plane from the face selected, you can either drag the face with the mouse or put a dimension in the box that has appeared. Once happy with the work plane's location then click the Green tick to confirm the location or the Red cross to cancel the operation.

Midplane between two planes: Click the first plane and then the adjacent plane and a third plane will appear in the middle between the 2 selected planes.