To insert a parenthesis:
If it is not open, open the graphical business rule to which you want to add a parenthesis.
If the BR Language tab is not selected, select it in the bottom of the left frame of the Analytic Administration Services window.
Expand the Formulas folder. Select the type of formula to add, and double-click the formula or drag it to the desired location in the business rule on the Graphical tab.
On the Formula tab, double-click the left or right parenthesis toolbar button on the Custom Toolbar.
The parenthesis is inserted to the right of the last component in the formula.