找到CIS User guide的部分了，
You can also modify or delete a differential pair from your design.
In the project manager, click the design file (.dsn) or a schematic page file.
Select the Tools menu and choose the Create Differential Pair command. The Create Differential Pair dialog box appears.
好像是ORCAD没有像Altium那样的梯形的小符号来表示差分.
或者说我不知道怎么把它显示出来
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楼主
