Mirror
Interactive mirror tool
Creates a SDS Mirror constructor for each selected SDS object. Lets the user draw a line segment that defines the mirroring plane.
The mirror tool has the following option:
Connect - If checked connects the open edges after mirroring.
Нет такое "конект". В Transformation/Mirror есть мирор, но ето не то - Алт + мирор и получается что-то...