There is no standard drawing legend for access control, and different design units and designers have their own drawing habits.
The practice of CAD typesetting is very simple, and the specific operation steps are as follows:
1. The first step is to open the CAD software and draw a simple rectangle with the rectangle tool to demonstrate. As we can see, this rectangle is complete. You can only move as a whole after selection.
2. Then click "Modify" in the menu bar and select "Disassembly" in the drop-down menu.
3. Next, the prompt "Select Object" will appear on the screen. We click on the rectangle, right-click to confirm, and then decompose.
As shown in the figure, it turned out to be a whole rectangle. You can select each side separately and then move or delete it.