Mirror enities and delete original

[Mark McCallum]

I created these edges from a right end.
Saved them as an xt file.
Brought them back in and used the procedure below to mirror.
When trying to select chain in contour, if you click on more un-highlighted pieces of the chain it causes eCabs to crash.

Also as per attached second drawing is it possible to delete the original line set upon mirroring?

[Mark McCallum]

To make the above a little clearer.
I tried to use close contour to create the part.
The outline wasn't closed so went back to contour editor to try and close with the above results