Kismet supports grouping of networks in the network list. I use this feature sometimes to add all the networks around me that I already know about into one group, so that I can easily see new networks when they appear. To create a group, change the sort mode to something other than Auto-fit, and then highlight the network you want to add to the group; pressing T tags or un-tags the selected network. Once you tag all the networks you want, press G to create the group. Selecting a group and pressing U un-groups all its networks. Groups are marked with either a - for expanded lists or a + for collapsed lists. Pressing the plus (+) or minus (-) keys respectively will expand or collapse a group.