Always format the line item before entering a formula in it. The results of the formula must match the format of the cell. For example, if the formula results in a date, the line item must have a date format. The formula is rejected if the formats do not match.

When you write formulas, ensure that you follow these requirements:

- Close open parentheses.
- Enter all required arguments for any functions that you use.
- Do not nest more than 100 functions in a single formula.
- Enclose line item names that contain hyphens, numbers, or operators (+ - / *) with single quotation marks.

To find information on functions, operators, and how to write formulas, see All functions.

To add a formula to a line item using the formula editor:

- Select
**Blueprint**, then select the line item. In the formula bar, the line item name appears next to the editing field. - In the formula bar, select the line item name, or
**Expand**to the left of the line item name. The formula editor opens in preview mode at the bottom of the window.

**Note**: You can also open the formula editor while you're editing in the formula bar by switching to another module. - Select
**Edit**to activate the formula editor. - Enter the formula in the editor:
- Type functions, operators, and references directly into the editor.
- To add references to line items in the same module, select the line item. The line item is automatically added to the formula editor.
- To add references to line items in different modules, open the modules that you want to refer to and select the line items. The formula editor stays fixed at the bottom of the window when you switch between modules.

- Select
**Apply**when the formula is complete. The formula is added to the**Formula**cell.

**Note**: Select**Cancel**to discard the formula and return to preview mode. Select**Close**to close the formula editor. - Optionally, specify which versions of the model the formula applies to in the
**Formula Scope**column in**Blueprint**. The**Formula Scope**option defaults to**All Versions**.

## Move and resize the formula editor

When you write formulas, you can move and resize the formula editor.

Select

If you dock the formula editor to the bottom of the window, resize it by hovering your cursor over the top of the editor, then drag the blue line up or down.

If you dock the formula editor to the right of the window, resize it by hovering your cursor over the side of the editor, then drag the blue line from side to side.