Is it possible to increase the overall height of the flow headings frame.
This is to incorporate a flow translation text frame.
I use the flow ‘otherinfo’ data to store flow translations.
With some works the vertical space is inadequate for a long lyric translation. I’ve tried using the First Page default template but run into problems related to flow tokens (specifically {@flowtitle@}) in the first page template.
This creates a domino effect for my default formatting.
Suggestions?
Yes, it is.
One can either stretch the frame on the page or create a new header template.
Thank you for the useful information. 
How?
Neither of those options work in trying to extend the default frame or working with a new frame. There seems to be a vertical limit that has been imposed upon the flow frame.
How many lines of text did you plan to add, or how many inches did you need to stretch the frame?
It could be up to half a page or more of text at 10/12 points.
As the flow frame also has to contain text frames for the flow title, Editorial information and composer details at least 20 lines of text frame could be required
I have had to compromise the lyric translations in terms of the strophic nature of the original poetry by flowing text that doesn’t match the original to avoid the vertical frame limit.
Although for some reason the music does not automatically get out of the way
(@dspreadbury , why?) increasing the size of the flow heading field does not.
Trying to create a new flow frame produces this result…
The maximum dimensions remain fixed. The Title and Editorial frames are roughly what one might want. The ‘lyric’ frame content overflows at either end depending upon your cursor.
One can stretch the header downward on the page, but this will present a page override and require one to manually move the start of the music below the extended flow header.
Yes. I do that I lot… This doesn’t solve my fundamental problem.
If I only move the score this doesn’t create an override which I most definitely prefer.
I’m trying to create a consistent process rather than faulting the system for scores of 4 to 8 voices in this collection with translations of each work in the flow title (first) page.
I’ve actually finished the work (52 choral compositions) and was not happy with the page formatting and started to modify what I had done to:
avoid page overrides
have enough space for the translation
have a visually satisfying first page system/s
I wasn’t happy with the space for lyrics in the flow ‘window’ and started playing around with it in the main first page formatting. This created problems with flow tokens in the ‘project’ area, particularly, where {@flowtitle@} would disappear (no overrides). The other tokens were unaffected. I spend hours trying to find a workaround and decided to go back to positioning the translation in the ‘flow’ window. I’m still not satisfied because of this vertical limit.
I certainly do not want to have to set this information separately in Indesign or the like when tokens and formatting in Dorico are theoretically so much more useful for my workflow.
I have only done it once, but:
You can make as many Flow Header Templates, as you like.
As far as I remember, they expand automatically depending on their content (that’s different from Page Templates).
To use one of your custom Flow Header Templates, invoke a Flow Header Change.
Does this help?
I have never changed these values, so I don’t know if doing so will achieve what you want, but in Layout Options > Page Setup > Flows there are settings for Flow heading top margin and Flow heading bottom margin. My guess is that increasing the value for Flow heading bottom margin will push the first music system downwards. I might be wrong, but it could be worth having a look.
You would need to have Show flow headings to be set to For all flows.
No, the flow heading does not seem to expand. One would have to create different flow heading templates for different lengths to approach what Carlo wanted.
If you find I have missed something, @k_b, please let me know.
