Logos, A Little Help, Please

I need some assistance from the ‘folk in the know’ and I feel fairly confident that ‘where one has a question, others do too’.  So, here’s my issue:

Making a reading plan in Logos 5 is as easy as pie (and I love, love, love the program).  I select ‘reading plan’ and then I choose the book, the schedule, and click ‘generate’ and lo and behold, there it is.

What I can’t do, though, is generate a reading plan for more than one book, even if it’s in a series.  So, for instance, if I want to read all Calvin’s commentaries or all Luther’s works, or all Zwingli’s stuff, or all of Bullinger, or Robertson, or any single particular author, there doesn’t seem to be any way to select multiple volumes.

Is there a way to do it and I, being particularly ungifted in such technicalites, have overlooked it, or is there just no way it can be done?