Step 1. Create an offset work plane from the bottom of the case. You can also offset your work plane from the underside of the top of your case or the top/bottom edges of lid/base.

Step 2. Enter the measurement you want the height of the partition to go to.

Step 3. Click the green tick to confirm the work plane.

Step 4. Select the edit tool, click on your existing partition to want to change the height of.

Step 5. Click the top face of the partition.

Step 6. Now select the horizontal partition.

Step 7. You will see that you partition has now snapped to the new height.