Creating a surface from points
Select the points you want in the surface.
From the Contextual menu, touch and hold the screen, then selct Calcs, then select Create TIN Surface...
From the Calc wizard, in the Data menu, select TIN Surface from Pts/Lines.
Preview the TIN surface Calc Wizard before it is created.
Name the surface
Give the surface a name.
Check the Set as current surface box.
View the surface
Your surface will appear on the screen.