I think it’s possible (both linking x-axis time windows across multiple questions in a dashboard and having a filter only affect ONE question on the dashboard)
All it depends on is you define a filter on your dashboard linked to a x-axis timeseries field and use that to control your question(s).
In the image below I just used the ‘A look at your People table’ automagically generated dashboard in the Sample Dataset of a fresh install. I then went into Dashboard edit mode and selected the created at filter. I changed it to a
between filter but I would expect it to work for a
previous period filter as well. Then it’s possible to select or remove the link to time window fields for questions. You can se I removed the link to the ‘New People I the last 30 days’ so it’s not controlled by the filter any more.
After I took the screenshot I saved the dashboard. Created a new question displaying total Orders by month shown as a line graph. I could then add it to the dashboard and link to the order dates. So, I think the foundation is there.
Oh, one last thing, @brianwilson you mentioned “combo” charts. If you’re referring to combining multiple questions in one chart there are some possibilities as well see https://www.metabase.com/docs/latest/users-guide/09-multi-series-charting.html