Trelis 16.5 User Documentation
The reflect command mirrors the body about a plane normal to the vector supplied. The reflect command will destroy the existing body and replace it with the new reflected body, unless the copy option is used.
To Reflect an Entity
{Body|Volume|Surface|Curve|Vertex|Group} <range> [Copy] Reflect <x-comp> <y-comp> <z-comp>
{Body|Volume|Surface|Curve|Vertex|Group} <range> [Copy] Reflect {X|Y|Z}