Erik Kostson
Ansys Employee

If you use the meshing inside mechanical then we do not have any or much control of numbering (e.g., element).
The best way to do what you want is to write a small script (python, matlab, etc.) that writes the nodes and element numbers as you want (this can be done for regular geometry shown). So in essence you will write a .cdb or ds.dat file with the node numbers (using N command or NBLOCK) as you want, and element numbers (using E command or EBLOCK) as needed, and then read that in via external model (that should preserve the numbering defined in the files).
All the best