Adding a formula This section provides a general description of the steps to adding a formula. To add a formula: Open the Formula Builder page. Select a CPM model. Select Activity > Check Out. Select a schedule line. Select a line type. Add the formula. You can: Use the function buttons. Clicking a function automatically adds the correct syntax to the formula pane. Copy and paste formulas from other schedule lines. Drag members from the Members list and drop them into the formula. Repeat steps 4 through 6 to add or edit other formulas. Click Save. Select Activity > Check In. Click Release.