The board outline can be imported by the following method.
1.
Gerber Mechanical plots → select Board outline → Execute.
2.
File → Gerber viewer setup → Gerber preprocessor → Select the GBR file → Preprocess and view.
3.
Graphic imports → import categories → board outline → import artwork files.
4. Right click
Import Categories → Import to all categories and Select
Yes.
5. Transfer category to
project → Select Yes.
6.
Tools → Reconstruct from Graphics → Reconstruct Board Outline → Arrange the board outline to be fit to the template.