1. To modify a certain word or number in large quantities, you need to use the search and replace function in CAD. Take the following picture as an example, replace the two 2.5×2.5 in the picture with 3×3.

2. Click Edit on the menu bar and select Find in the pop-up drop-down menu.

3. In the pop-up Find and Replace dialog box, enter 2.5×2.5 in the “Find content” column, enter 3×3 in the “Replace with” column, and click Replace All to replace the two characters in the picture. All 2.5×2.5 are replaced with 3×3.

4. If you only want to replace one of them, click the Find button.

5. At this time, the graphic will move to the found text, and the text is in the editing state. At this time, click Replace to replace the currently selected text. If you click Find Next, the search for replacement of the current text will be given up. For the next text, repeat the above operations until you find the text you need and replace it.

6. If you only want to replace the text in a part of the image, you can select the area first, then enter the Find and Replace dialog box, select "Selected Object" in the "Find Location" column, and repeat the above operations. You can replace text in the selected area.

7. Complete the renderings.