To partially answer my own question I have part of script that is half baked.
Set Variable [$serialNum; Value:MAIN:Serial Number]
Go to Layout ["#2 chunks" (MAIN)]
New Record/Request
???
At this point I need a command to copy my previously declared
variable into into the "Linkto" field of file, "chunks", the external
portal db file.
I designed this system to distribute the chance of any one piece of
the database corrupting. I'd like to keep what I have, but I switch
to two tables in one file, if the solution requires it.