The version I use is PDAS Layout2007. Let's assume that the chamfer radius is 5mm.
1, first set the unit. "Tools" → "OpTIons...", select "Metric" in "Design units" of "Global", OK. (Of course, if you are familiar with the conversion between international units and imperial units, you don't need to set up)
From "Tools" → "OpTIons...", select "Design", select "Arcers" in "Miters", and OK.
2. Select the border, right click and select "Add Miters".
3. Fill in the chamfer radius 5 in the popup dialog box, OK.
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