1. A computing system comprising: an electronic display configured to display items of textual information, the items of textual information including one or more headings; a microphone configured to receive audio input from a user of the computing system; one or more computer processors in communication with the electronic display and the microphone and configured to execute software instructions; and one or more storage devices in communication with the one or more computer processors and storing a rule set and software instructions, wherein the rule set includes selected text action rules, and wherein the software instructions are configured for execution by the one or more computer processors in order to cause the system to: display, on the electronic display, the items of textual information to the user; receive, from the user via the microphone, an audio input including at least a command and a heading identifier; in response to receiving the command and the heading identifier, determine, based on the rule set, a first item of textual information following a heading associated with the heading identifier, wherein the first item of textual information includes one or more subheadings; select, based on the rule set, the first item of textual information; and in response to determining, based on the selected text action rules, that the first item of textual information is to be deleted or replaced: determine the one or more subheadings and textual information associated with each of the one or more subheadings; and delete or replace the textual information associated with each of the one or more subheadings but not the one or more subheadings.
3. The computing system of claim 1 , wherein the rule set further includes text selection rules, and wherein the first item of textual information is determined based on the text selection rules.