how to convert polyline object (with x, y, z) to TIN SURFACE
BECAUSE IF THIS OBJECT STILL POLYLINE OBJECT, I CAN'T RUNNING CATCHMENT AREA, ADD LABEL ETC
You're going to have to provide more information for us to help you. Are these polylines contours or something else?
....AND THERE'S NO NEED TO SHOUT...
(No connection with Autodesk other than using the products in the real world)
IDSP Premium 2014 (mainly Civil 3D 2014 but also 3ds Max Design)
Win 7 Pro x64, 256Gb SSD, 300Gb 15,000 rpm HDD
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NVIDIA Quadro 4000, Dual 27" Monitor, Dell T3600
Are these polylines contours or something else?
It doesn't matter, sir.
Whatever they are, you can add 'em to the surface definition, either as contours, and as simple "drawing objects".
If the OP wants to avoid unnecessary triangles on the edges, he adds the most outer poly (2D od 3D) as a boundary.