Design made using polylines

Hi There,have made a design using the polylines in cc,but I find I need to open them up so to add another addition,is it possible to do this or do I need to redraw??

Select the polyline (ungroup first if need be) and go into Node Edit mode:

See:

https://willadams.gitbook.io/design-into-3d/2d-drawing#curves

for further details.