This project for VB6 creates an add-in dll that allows you to Boolean Add all selected solids in a single operation. It also provides an Undo for the completed operation.
Copy the compiled dll to the Draggers folder in the TurboCAD Program directory.
Put in some additional comments into the code regarding UndoRecords and deleting Graphics.
If you remove a graphic using UndoRecord.DeleteGraphic, don't then use the Delete method on the same graphic. Doing so can cause TurboCAD to crash later if you Undo the operation, then re-use the tool.
MyUndoRecord.DeleteGraphic MyDeletedGraphic ' -- marks the graphic for undoable deletion. No problem here
MyDeletedGraphic.Delete ' -- BAD IDEA
[attachment deleted by admin]