I think I can support at some level, but if you can attach your packaged workbook (***.twbx), it's much easier to understand the issue.
Could you? Even only part of data is fine.
Thanks so much for your offer of help, but I figured this out while away from my computer last night. I think I had just been staring at it too long. This was simpler than I had imagined (although hey, maybe there's a more complicated way to do this that might come in handy in other circumstances.) This is what I did:
1) I created a parameter to specify all data I want to have available in my view, regardless of destination format--a list of subject codes from a field "Code" in my source. The codes are identifiers for a range of topically related measures, hence my desire to have them in the same dashboard.
2) I created three different calculated fields, each drawing from a subset of the parameter codes, like this:
WHEN "code_a" THEN [code]
WHEN "code_b" THEN [code]
All my elements draw from the same source field, as you can see--this is different than most examples I've seen of this strategy, which seem to use parameters to pull in data from different fields.
3) I created three different workbooks, one for each calculated field. For each, I dropped the correct calculated field into the filter box and set it equal to the original parameter.
4) I built correctly formatted graphs for each.
5) I created a dashboard, and dropped all three worksheets into a container. Then I removed the worksheet titles. Now I can use a single parameter control to cycle through all 8 views--which are secretly three different worksheets.
Now I need to pull data tables for each view into a second container controlled by the same parameter control, then pull titles and captions in from two more worksheets so the text can also dynamically swap out with the control. I don't think that will require any strategies that are substantially different from what I've already done here, though.
And I need to figure out how to sync the x-axis alignment between the charts and the data tables.....that's my project this morning.