This tool is available only in the Desktop version in the File menu and in the toolbar with the 
Change Layer button to create a TIN vector model file from the selected vector layer or an individual attribute table.
Generate TIN
Opens the Generate TIN panel to create a TIN vector file from vector feature layer or from the layer's attribute fields.
Generate TIN panel
Layer - List the available vector layers and attribute tables from the current map view. Select the layer from the drop-down list that contains x, y, z data as geometry or attribute data.
X - List the attribute fields of the selected layer. Select a data field that stores the X coordinates.
Y - List the attribute fields of the selected layer. Select a data field that stores the Y coordinates.
Z - List the attribute fields of the selected layer. Select a data field that stores the Z coordinates (heights values).
[ ] Use geometry - The TIN generator uses only the geometry to create the TIN file.
[x] Skip points with 0 height - The TIN generator skips the zero heights from the geometry to create the TIN file.