When you are working in ANSI-format files, the Code Editor, by default, places tab stops at columns 7, 8, 12, 73, and 80. Use the Tab key to move the cursor to the next tab stop, or the Shift+Tab shortcut to move to the previous tab stop.
As described in Customizing Tab Stops, you can set up to 32 custom tab stops. You can also set a default tab interval that determines how far the cursor moves when you press the Tab key and no tab stop is set. If you specify a tab size of 3, for example, each press of the Tab key moves the cursor forward 3 spaces. This can be useful for maintaining consistent indenting when working with IF or EVALUATE statements, for example.
Tabs may also be used to move blocks of text in your code. Highlight the lines of code you want to move and press the Tab key. The entire block of text shifts to the next tab stop (or to the tab size interval that you have specified).