Hi IanGoddard606749,
I am not sure if you were able to figure out the 'period' option you were referring to. But were you by chance referring to the period object? If it is the case, then in the Process Assembly you can create the period object there and access it.
Or if you mean when starting the job? Such as right clicking the job (in the Process Assembly) --> Execute --> Execute recurring there is also an options for using Period there.
There are various places that allow the uses of 'period', so where was the one in V8 where you particularly referring to?