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What happened to drop bspline curve tool?This tool existed on the Modify Curve toolbar and was used to convert bspline curves.
This tool has been replaced with facet curve tool on the Curve Utilities toolbar. This tool can be used to convert curved elements and B-spline curves to lines, a line string, a stream curve, arcs, or points.To open toolbar go to:Tools>Tool Boxes pull-down menu.Check the Curve Utilities
Facet curve is the second tool from the left on the toolbar
https://communities.bentley.com/products/microstation/w/microstation__wiki/14165.how-can-you-place-closed-bspline-curve-with-a-fill
http://communities.bentley.com/products/microstation/w/microstation__wiki/16075.drop-b-spline
Castellano