Select one Z column (or a range from one Z column). If the Z column has associated XY columns, then the XY columns are used; otherwise, the worksheet's default XY values are used.
Select required data from worksheet.
From the menu, choose Plot > 3D: Line + Symbol: 3D Trajectory.
Click the 3D Trajectory button on the 3D and Contour Graphs toolbar.
(Installed to the Origin program folder).