I have a five lines feature classes that I originally created individual TINS (Create TIN gp tool) for, from the TINS I created rasters (TIN to Raster gp tool). I then mosaicked all the grids into one master grid(Mosaic To New Raster gp tool) using the mosiac operator of maximum.
Looking for a way to be more efficient, I merged (Merge gp tool) the five line feature classes into one line feature class, then converted the lines to a TIN (Create TIN gp tool) and the TIN into a grid (TIN to Raster gp tool). All feature classes are in a file geodatabase.