indexing layout for larger capacity

HI list,
I tried to search the archives for this answer, but the term index
has multiple meanings in this field.
Plasmacam manufactures a 4'x4' plasma table, but claims to have 4'x
unlimited capacity because you can "index" the material and move it
down and resume cutting. Is this a cad or cam function, and, do I
need a specific programm for this or is it a feature most cad/cam
programs utilize?
Thanks, Dale