1. A computer-implemented method, comprising: outputting, at a computing device and for display, a spreadsheet document that includes one or more data cells and a document tab; receiving, at a computing device, an indication of a user input selecting a document entry in the spreadsheet document for applying conditional formatting to the document tab based on the document entry, wherein the document entry is one or more of the one or more data cells of the spreadsheet document; outputting, by the computing device and for display in response to the user input selecting the document entry in the spreadsheet document, a conditional formatting user interface for associating one or more conditional formatting rules with the document entry and the document tab; receiving, at the computing device, an indication of a user input of one or more conditional formatting rules linking a property of the document tab with the document entry; and changing, with the computing device, the property of the document tab based on the one or more conditional formatting rules.