How to use external references to display only a portion of a graphic

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Since I work in the field of manufacturing processes, my knowledge of CAD is limited – I started using it relatively late, so I’m not familiar with some of its functions. I hope everyone can offer some guidance. How can I take a complete graphic and, through modifications, cropping, and external reference functions, display only a portion of it? Then, how can I arrange equipment and pipes within that selected area? As shown in the figure below, I only want to edit the parts indicated there and add new frames. How can I use external references to hide other areas? Also, when making a selection, the graphic becomes unavailable for cropping. Why is that? Attached is another article from the Internet; I didn’t quite understand it. In the process of using CAD, it is common to encounter a situation where, after exploding a block and inserting it, the content displayed by that inserted graphic changes. Not only is the block expanded in its original location, but there is also additional content outside the range of the original block, as shown in the figure below. The graphic after expansion contains more display content than before, and it seems that some content that was previously hidden becomes visible after the block is expanded. What caused such a change? We can locate the block by its name and insert it using the INSERT command. By comparing the diagrams, it can be seen that the shape of the block before it was split does not match that of the block; rather, it is the shape of the block after it was split that corresponds to its actual content. What’s going on here? How can I make a block display only part of its content while hiding the other part? After creating a block (or external reference), it can be clipped using the following methods: 1. Enter the XCLIP command in the command bar, or go to the menu: Modify -> Clip -> External Reference. 2. Select the external reference (or block) that you want to clip. 3. At the command prompt, choose “Create New Boundary”. 4. Select a polygon or rectangle to form the clipping boundary, and thus the external reference (or block) will be clipped. It’s important to note that after clipping, the parts of the external reference (or block) outside the clipping boundary are not deleted; rather, they are hidden, with only the content within the clipping boundary being visible. Just like the block in the figure above, when we use the EXPLODE command to break apart this block, the parts that were hidden due to cropping become visible. Additionally, we can use the XCLIPFRAME variable to control whether the clipping boundaries of external references (or blocks) are displayed. When the XCLIPFRAME variable is set to OFF, the cropping boundary is not displayed ； When the XCLIPFRAME variable is set to ON, the cropping boundary is displayed. If, while using CAD for drawing, we need to temporarily hide external references (or blocks) in certain areas, we can use the XCLIP command to achieve this.