How do I save a segmention polyline, change it and reimport it?

[quodlibetarian]

I wish to create standard segmentations and edit them.

I can create a segmentation polyline and save it to the DB tree as part of the segmentation process. Then save the DB tree entry to a .bin file and reimport that .bin file to another .bin file.
However, I can not change the coordinates of the polyine once it is created, eg in the .bin file.
Saving / restoring as .dxf or .poly does not work as the polyline is no longer useable in segmentation.

Any suggestions, please?

[DA523]

In DB tree pane
-select polyline
-save it alone as DXF
-edit it with any CAD (QCAD FeeCAD)
-save it
-drag and drop into CC

[quodlibetarian]

Thanks :)