The Quarter of Calendar function is supported, returning an integer 1-N, the number of Quarters Since Q1/1900. When dragging a Quarter of Calendar into a variable, the following tree element is created.
Variable Creation > Input > Variables: SQL Elements pane - Calendar > Quarter Of Calendar
Columns and/or other expressions that resolve to a date can be moved over the (empty) branch of the tree.
There are no special properties for the Quarter of Calendar function.