you can use MEASURE to place the points along the pline at the intervals of 100 and add one point at the end for the leftover. mapexport the points to SDF file and put the sdf into the map. use the FeatID as a label.
However, placement and alignment of the label question. do the labels align to the utility line aligned as one long straight line or are they placed vertically above the map view and align in your top banner to the "x" location of the interval with variations in spacing in the top banner?
i.e. if the pipe runs perfectly east west the lables will be evenly spaced in the top, along a curve varying spacingn to s the labels pile on top of each other unless yopu rotate the alignment on a sheet.
do you rotate the sheets so the lines are basically horizontal across each sheet?
In the field soes someone check of each 100 foot interval as installed in a database?
dave