Clipping a corridor in 3D

Hi everyone.

I´m using PowerRail track v8 series and I ´ve got a big question in regards to corridor clipping.

I´m not looking for a 2D clip with a closed shape and all the layers/components are clipped vertically but I´ve got a kind of footpath along my corridor which intersects with, it clashes with different components of the template and I´m trying to delete that small part but it has been imposible so far.

I have tried to create a terrain from the cell (the footpath) but is not found for a target aliasing, to use corridor references but nothing, what could be the workflow?

I hope this screenshot explains better the situation

Thank you very much in advance !