Select the piping segment which should be mirrored. Then click the toolbar icon. The mouse cursor appearance will change. Next, select the node which belongs to the plane. The segment will be mirrored relative to this plane.
The following dialog window will be displayed:
Select the plane relative to which the mirroring should be performed. Plane could be one of the global planes or one of the local planes of selected pipe.
If the "Copy selected piping" option is selected, a copy of the selected segment will be made and this copy will be mirrored. If this option is not checked, the selected segment itself will be mirrored.
Click Apply and then OK. You will be asked if you would like to insert a tee in the branch node.
While mirroring operation these elements will be mirrored too:
Pipe element uniform loads
Node concentrated forces
Restraints in the custom restraint
restraints in the custom expansion joint
Tools > Mirror