Most indenting of program code is best handled by the VLISP automatic code formatting and Smart Indent features, and by customizing the formatter's options (see About Formatting Code with Visual LISP [AutoLISP]). But there are some things you may want to do by yourself.
To indent selected lines of code, press Tab or press Ctrl+E, and then click Indent Block. VLISP inserts a Tab character at the beginning of each line you selected. You can control the indent amount of the Tab character by clicking Tools 
Window Attributes Configure Current and setting the Tab Width value. You can also use the following keyboard shortcuts to adjust the indentation of text.