In 3DEXPERIENCE it is possible to use the “ReUse” command to program opposite part.

This new way can replace copy/tracut methodology …. with benefits: toolpath simulation, allow modification if the opposite part is a little bit different !

In the attached zip, there is a PPT to explain the way to use it and videos.

This has been done in R2019x, but also possible in 2020x and 2021x On the CLOUD