You may want to use separate libraries for templates that deal with different matters. For example, you may want to create one library for divorce templates and another library for estate planning templates. When you create a library, you create an .HDL file on the disk. Once it's created, you can add references to templates to it as well as organize it in whatever way you need.
By default, all new libraries you create will be saved in XML format. If you need to use the library with versions of HotDocs prior to HotDocs 2009, you must specify this format by choosing Save Library As from the File menu and then choosing HotDocs 2005-2008 Library from the Save as type drop-down list. (See HotDocs and XML File Formats for details.)
Once you create a new library, you can add templates and other files to it. See Add Templates and Other Files to a Library.
See Change HotDocs Program File Locations for information on the default location HotDocs looks for and saves library files.