A tool for manipulating data entries that cannot be visualized in a user interface. A user interface displays a plurality of data entries that fit in the user interface, where the plurality of data entries are from a larger group of data entries. The tool generates and displays a marker (text line or icon) representative of at least a subset of the remainder of data entries from the larger group. A user directing an operation request to the marker causes the operation to be performed on the data entries represented by the marker.