If you're looking for a shortcut for writing out all of your selectors, then a CSS Preprocessor (Sass, LESS, Stylus, etc.) can do what you're looking for. However, the generated styles must be valid CSS.
Sass:
#applyCSS {
.ui-bar-a {
color: blue;
}
.ui-bar-a .ui-link-inherit {
color: orange;
}
background: #CCC;
}
Generated CSS:
#applyCSS {
background: #CCC;
}
#applyCSS .ui-bar-a {
color: blue;
}
#applyCSS .ui-bar-a .ui-link-inherit {
color: orange;
}