I use InDesign and haven't used Quark in many years, but I think they handle style sheets similarly. you creating a style sheet just for a single type style? It's better put together sheets containing multiple styles according to task, like "body copy," "blah-blah paragraph style," "headers," "captions," etc.
Maybe try setting up a Basic Paragraph style sheet. Then select this sheet and choose "New Paragraph Style" and give it a new name. Select formats from there. You can also create style groups by clicking on the folder in the Paragraph Styles panel, and dragging and dropping into the appropriate new folders. You can also add a "Next Style" to a style sheet. You can also create nested styles, and import/export styles from other documents.