Add a via connecting ther shapes together that you require, then Edit - Copy and set the copy mode in the options menu (rectangular or polar) and qty in x and y, also make sure retain net of via is checked, then pick the via you wish to copy and pick an origin point and you have the array.
You can also use the Manufacture - Thieving command and add the thieivng vias across the board then once there use Padstack replace and replace the surface mount thieving via with an actual PTH one.