import

You may @import an external Less file to include it. Some options may be specified along.

Options:
reference use a Less file but do not output it
inline include the source file in the output but do not process it
less treat the file as a Less file, no matter what the file extension
css treat the file as a CSS file, no matter what the file extension
once import the file only once and subsequent import statements for that file will be ignored
multiple allow importing of multiple files with the same name
optional continue compiling when the file is not found
If the imported file does not have a .css extension, it will be treated as a Less file.
@import "foo";      // foo.less is imported
@import "foo.less"; // foo.less is imported
@import "foo.php";  // foo.php imported as a less file
@import "foo.css";  // statement left in place, as-is

@import (multiple, optional, reference) "bar.less";