> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cfo.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Reference properties

A formula can use other properties as inputs. Write property names the same way they appear in CFO.ai.

## Plain references

A plain name reads the property in the current segment:

```text theme={null}
Revenue
```

If the formula is calculating Sales, `Revenue` means Sales Revenue. If it is calculating West, it means West Revenue.

## Names with spaces or punctuation

Wrap a name in backticks when it contains spaces, punctuation, an operator, or a reserved word:

```text theme={null}
`Cost of Goods Sold`
```

Example:

```text theme={null}
Revenue - `Cost of Goods Sold`
```

## A specific segment

Use brackets to replace one part of the current segment:

```text theme={null}
Revenue[Region: "West"]
```

Other dimensions still follow the current segment.

## An absolute reference

Prefix the property with `$` when the lookup should not inherit the current segment:

```text theme={null}
$Revenue
```

You can combine an absolute reference with explicit filters:

```text theme={null}
$Revenue[Region: "West"]
```

Use absolute references carefully. Most formulas should follow the segment they are calculating.

## Duplicate names

If two properties have the same name, CFO.ai adds a short disambiguator:

```text theme={null}
Revenue#a3f
```

Use the shortest disambiguator offered by the editor or Ari.

## Date granularity

Add a granularity to Date when the formula works with time buckets:

```text theme={null}
Date.Month
```

Supported granularities are Day, Week, Month, Quarter, Half, and Year.