I'm not if I caught the gist, but I made an attempt.
However, the details may not be suitable for your true setup.
Would be grateful if you would post a workbook of a small set
of fake data in the form similar to your true dashboard.
If it would work for your Chart2-yearly, I think you could use
a level of detail calculation that would fix that year's amount
to every row of that year. Then when you use your Chart1
daily filter, it will filter Chart2 to display the same fixed amount.j
Please see workbook v10.3 attached in the Forum Thread.