@zingzong it is possible in the sense that you can have something working after spending a good deal of time. You will also need to come up with a way of translating the logic of the game into the Events/Actions. There is not a "strategy template" or "strategy unit" that come with Construct2.
I do however suggest that you start with something simple, as in a small strategy game where the player click on a unit in a small square grid and then moves one square only. With simple attack/defense values stored in instance variables.