What I am trying to achieve is the ability to transfer files from the PC to the mainframe as well as then deleting those files after the transfer.

I have a solution, but would appreciate someone saying either "Yepp, that's roughly the way to go" or "No, MUCH simpler to do it this way instead"

I started by creating a DOS BAT file containing the following

echo on
"C:\\Program Files\\BlueZone\\bin\\BZFTP.EXE" /Fmichael.zft /A"C:\\Users\\userid\\OneDrive - xxx\\BlueZone\\Transfer\\PCTOTSO.BTL"
del "E:\\xxx\\userid.TEST.CLIST\\Beyond_compare_PC_and_TSO_files\\Merged_TSO_scripts\\BACKUP*"

Michael is my standard configuration connnect file.
PCTOTSO.BTL contains this scenario

STOR "E:\\xxx\\userid.TEST.CLIST\\Beyond_compare_PC_and_TSO_files\\Merged_TSO_scripts\\BACKUP" TEST.CLIST(BACKUP)

When I run this from a DOS window, I get prompted for my mainframe pw (as expected). The file is transferred as expected, and then Rocket waits 
for me to close the connection (I like the fact that I can see the log results so I know the transfer worked).
Once I close the connection, the DOS command to delete the PC file is run.

Is this the way to go? There is no way of baking a DOS command into the BTL file ?