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I am missing something here? I am using a variation of Winterm's approach. Set up a 2-column document and add the two frames to the left hand master. Thread them to the appropriate frames on the right hand master.
On the body pages, auto-flow the 1st story in the column 1 frame and then the 2nd story I the column two frame.
If I add more text they flow correctly, If I edit the master page frames the text reflows.
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Unfortunately you can only have one primary text flow per document (one Primary Text Frame per Master Page) but that takes care of half your problem. Create a Master Page where the left text frame is a one column Primary Text Frame and the right text frame is a normal one. Then on the first document page flow in the text for the left column (the Primary Master one) and making sure that in InDesign preferences that Smart Text Reflow is set to end of story flow in the text. As many pages as are necessary will be created to accommodate the text. Then in the Pages Panel select all of the pages in the document and in the Pages Panel pull down menu choose "Override All Master Page Items." Then as highlighted in the screen shot below with the regular selection tool click on the text overflow port on the bottom of the first right hand text frame and the on the top port of the right hand column on the next page. Repeat this process for all of the right hand text frames. When done flow the text into the right hand columns.
I am missing something here? I am using a variation of Winterm's approach. Set up a 2-column document and add the two frames to the left hand master. Thread them to the appropriate frames on the right hand master.
On the body pages, auto-flow the 1st story in the column 1 frame and then the 2nd story I the column two frame.
If I add more text they flow correctly, If I edit the master page frames the text reflows.
Barb,
Actually, we share exactly the same approach, I'm just using incorrect terms. 
Still need to find a reason to use 'true' Primary Text Frames (those set in Document Setup dialog box). Bill is right at this point - you can't have true multiple Primary text flows per doc, and this make 'em pretty useless to me.
What I call Primary Frames are just empty text frames drawn manually at the Master Pages and used as placeholders for text on pages. These do not have 'true Primary' limitations, while keeping full useful functionality. Exactly as shown in you nice screenshots 
I'm not clear why, Bill. This works the way I expected it to.
Barb, Bill's right there can only be one Primary Text Frame per master page. None of the frames in your capture are primary, which isn't necessarily a problem. In this case, where there will be two running text threads per page, most of the advantages of the primary text frame are lost because you will always have to deal with the master text thread that is not primary, so the OP might as well use two regular threaded frames, override and autoflow them on the pages.
The first frame of a primary text thread has an icon with an arrow:
If I try to make the right hand thread primary, the left hand column loses its primary status:
Bill Silbert wrote:
Create a Master Page where the left text frame is a one column Primary Text Frame and the right text frame is a normal one.
What's the difference? I create two 'normal' threaded pairs (or three, or four... whatever) and have the same functionality, with the same type of text frames. Keep it simple 
rob day wrote:
most of the advantages of the primary text frame are lost
Would you mind to be a bit more specific at this point? What advantages? I hope I'm missing something here and I'm eager to learn
The only difference I see so far is that you don't need to detach 'Primary Frames' from master. Well, that's not a big deal to Ctrl+Shift+click on the first frame of each thread.
Would you mind to be a bit more specific at this point? What advantages? I hope I'm missing something here and I'm eager to learn
If you only use a single master spread the more important feature would not be obvious.
For example here my A-Master and B-Master have regular threaded frames set in different positions
Pages with the A-Master applied and some text added the overridden regular frames
If I apply the B-Master to the 2-3 spread the B-master's text frames get added and the overridden A-Master's text frames remain.
If the two masters are using primary text frames, the application of the B-master is smart enough to replace the A-master’s primary frame with the B-master's:
100% correct., Rob. Today's lesson—don't try to answer questions while rushing around.
I did not use primary text frames (you can see that from my original screen shots) but instead threaded frames on the master page. I would like to delete my erroneous answer about them to Winterm but that would disrupt the thread so I shall just acknowledge it and will walk slowly away and let the rest of you take care of inderjodhs96299968​
~Barb
https://forums.adobe.com/people/Bill+Silbert wrote
If somebody else has another solution about how to make the second text thread automatically flow onto the same pages as the first I would welcome it.
Like it was said before (but with so many answers, I understand you got lost ^^), hold Shift key while placing text.
turns into 
and you should be done!
More about flowing text options here: Thread text among frames in Adobe InDesign
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