Switch Master Page usage by use of Paragraph Tags

[Theresa de Valence]

Hi Framers,

I used to be part of this list a long time ago, but something happened 
and I never managed to figure out how to rejoin. Now, I’m having no luck 
searching archives, so please pardon my asking questions you may 
regularly answer. It’s ok with me if you direct me to an historical link.

I have old book (v7) where I switch Master Page Usage from landscape to 
portrait by use of the Paragraph Tag , so I know that *once* I figured 
this out correctly. I can’t use the old book as a copy for my new 
document, so I have had to build this structure from scratch and I no 
longer remember how I did so.

Here’s what I find:

On Reference Pages, there is a line:
Book Update (Yes or No): Yes
which holds a table carat whose titles are:
Paragraph Tag Name, Right-Handed Master Page (or Single-Sided Master 
Page), Range Indicator (Single, Span pages, Until changed), Comments
Data are:
Heading1Port, RightPortrait, LeftPortrait, Until changed,,
Heading1Lan, RightLandscape, LeftLandscape, Until changed,,

Paragraph tags called Heading1Lan and Headin1Port have pagination set to 
start at Top of Page.

What else do I need to do?

Thanks,
Theresa