Convert Blocks to COGO Points
CADD Microsystems' Donnie Gladfelter overviews a method to convert AutoCAD Blocks with elevations to Civil 3D COGO Points via block replacement.
From the CADD Microsystems YouTube Channel.
and the CADD Microsystems blog.
All this rigmarole in Civil 3D. It does work. The problem is just a AutoCAD block definition replacement folks.
All you need is an external drawing version of the old LDT "POINT" block and use -Insert with *pathtofile\Point.dwg for the named ACAD block in the drawing. Note the vital * character. Now the blocks are Softdesk blocks and off you go.