A server device may transmit, to a client device, data and program code that instructs the client device to display a graphical user interface (GUI). The GUI may include cards associated with a first categorical group of a first plurality of categorical groups and a second categorical group of a second plurality of categorical groups. The toggling, dragging, and releasing of a particular card causes the GUI to: (i) display a grid interface containing vertical lanes associated with the first plurality of categorical groups and horizontal lanes associated with the second plurality of categorical groups, wherein intersections of vertical lanes and horizontal lanes define graphical boxes, (ii) slide the particular card among the graphical boxes, and (iii) associate the particular card with a third categorical group or a fourth categorical group defined by the graphical box that the particular card is released.