Typically the fully qualified source filenames look like:
<Drive-ID>\<DCIM>\<100_FUJI>\<DSCF0nnn.RAF>
The desired, final result is of the form:
<Drive-ID>\<Pictures>\<Classification>\<YYYY>\<Month (alphabetic)>\<renamed filename> where <renamed filename> is of the form:
<YYMMDD_Some-meaniingful-custom-text_0nnn.RAF>
or
<YY-MM-DD_Some-meaniingful-custom-text_0nnn.RAF>
where the <YYMMDD> or <YY-MM-DD> variable represents the shot-date; the '0nnn' part of the filename is taken from the original file name.
[Later Edit]:
Please note that the value of the 'Some-meaningful-custom-text' variable will change, to reflect the subject matter, even on a given shot-date
As I said, I can achieve all of this, but in two passes because - as you have confirmed - there is no 'Ingest from Selection' in PM5. I cannot justify the purchase of PM6 when there are other, free, offerings in the marketplace which can achieve the desired result in one pass - such as Bulk Rename Utility and Rapid Photo Downloader (Linux only) to name but two out of a population of perhaps 10 or so, excluding the option of writing my own script (shudder....). And, yes, I fully agree, there is considerable other functionality in PM5 which other options do not provide.