V8i:
I might have missed this in previous threads and no reference in help, but...
Default Print File Name has as a std. entry "$(MS_PLTFILES)$(basename(_DGNFILE))-$(MS_PLTMODELNAME)-<autoInc?digits=3?base=0> and this allows a pdf filename to replicate the dgn filename and create an extend string using the modelname and an autoincremented number for each generation of the file with zero as the first. Which is fine if drawing revisions are defined numerically.
Can the ?digits be changed to define a revision letter, starting at A?
TIA
Patrick