can splines be trimmed in draftsight

Hi all.

I traced a shape in Corel draw, then saved it as DXF. After opening it in Draftsight, it opened as a spline.

I wanted to edit it by adding a 30 x 3 tab so I could fit it through a notch lasered through a piece of 3mm mdf. this meant trimming the spline and the 30 x 3 rectangle so the laser would follow the outline.

I am unable to trim the spline or explode it, all I can seem to do is shape it by dragging the tags.

Any ideas?

Cheers.

Andy.

SolidworksDrawings And Detailing