When it comes to dashboards in Excel, we rely on the data validation list predominantly to act as user inputs based on which the Dashboard is calculated. But this approach doesn't Enable the user to multi-select values from drop down nor there is other straight-forward way which makes the life of end user to create such functionality.

So given this case, how do we achieve this?

Well, we can use the form checkbox and a bit of VLOOKUP to get around this and have multi-selection in your dashboard.

Below are the steps which should help you achieve this. Before that lets define our end goal. 

Lets say we have to enable to the dashboard to show total sales of fruits by month and the user needs to have a functionality of selecting single/multiple months.

Step1: Below is the data we are working with.

Step2: Lets have a simple table like below which should calculate sales based on dynamic month selection.

Step3: Enable the DEVELOPER tab on the ribbon above. If already enable skip step 3.

Click on 'More Commands'  in the 'Customize Quick Access toolbar' menu. Now 'Customize Ribbon'. Select the 'DEVELOPER' on the right-most slide and click OK.