1. A method comprising: receiving on a computing device, within a graphical user interface (GUI), user input to select a predefined data metric; displaying, within the GUI, a selection tree containing a plurality of graphical branches associated with a data dimension, each branch corresponding to a data attribute within the data dimension; and for each branch in the selection tree that is selected, generating a data query by the computing device to request, from a data storage system, data of the selected data metric that matches the data attribute corresponding to the selected branch.