Before talking about filtering a dashboard, let's see the previous dashboard from the Save As action. Create a new Sales Amazing Dashboard, which will cover only opportunity-related stuff (I've added a simple metric component that shows the number of opportunities for the current year):
This feature is very useful because it allows us to create a new dashboard without starting from scratch.
Now click Edit on this new dashboard and then the + Filter button to create a new filter:
This filter is based ...