After you add a source file to your project, you can edit it using
the ISE® software as follows.
To Edit a Source File
In the Design panel, select the appropriate Design View from the
drop-down list.
In the Hierarchy pane, double-click the source file.
Edit the file in the tool that appears.
Each source type launches a different tool to help you
edit the file, as described in Source File Types. See the Help provided with each tool for
detailed information.
Note After you edit the source file, you
may need to rerun certain processes to bring the project up-to-date,
as described in Running
and Stopping Processes.