在用Allegro设计 PCB过程中，有时候由于原理图改动，导致布局的改动。这就会导致走完的线要重新走，对于差分对因为前半部分的走线是不用重新走的。那就可以使用剪断后面部分的线，然后删除，提高走线的效率。那如何批量剪断走线呢？
（1）选择菜单Manufacture→Drafting→Delete by Rectangle（按矩形删除）
（2）Find选项卡只选择Clines
（3）然后框选要剪断的走线使其高亮，
（4）然后单击第一根走线上方绘制一个矩形框，如图所示
（5）绘制完，点击鼠标左键，走线量剪断，如图所示
右键Done，完成操作。
Allegro provides a good and interactive working interface and powerful functions, and its front-end products Cadence, OrCAD, Capture, the combination of high-speed, high-density, multi-layer complex PCB design routing provides the most perfect solution.
Allegro has perfect Constraint Settings, users only need to set the wiring rules according to the requirements, and the design requirements of the wiring can be achieved without violating the DRC when routing, thus saving the tedious manual inspection time and improving the work efficiency!
It can also define parameters such as minimum wire-width or wire-length to meet the needs of today's high-speed circuit board wiring.
Constraint Manger provides a simple interface for users to set and view Constraint declarations.
Its combination with Capture allows E.E. electronics engineers to set up regular data when drawing a circuit diagram and bring it with them to the Allegro working environment, where it can be automatically processed and checked when placing parts and wiring. The empirical values of these regular data can be reused for the same nature of the circuit board design.
In addition to the above functions, Allegro's powerful automatic push and stick line and perfect automatic repair line function provide users with great convenience; The powerful mapping function can provide multiple users to deal with a complex board at the same time, thus greatly improving the work efficiency.
Or use the optional graph cutting function to cut the circuit board into various blocks, so that each block has a full-time person at the same time to design, to achieve the purpose of the same graph design and can shorten the time course.
After renaming, online interchange and modifying logic during routing, users can easily return to Capture wiring diagram, and update the wiring diagram to Allegro after modification.
Users can also click and modify objects between Capture and Allegro.
