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# Can I Calculate a Combined Product Field for 'Packages'?


## ${color}[#1a63ba](Combined Product Field)

To calculate an additional field per order based on specific products, follow these steps:

1. Add a Custom Column

2. Set the [Export Mode](/en/article/export-mode-35l3c/) to "Compress"
* This ensures each order appears as a single line while still including the necessary order details.

3. Select the Identifying Order Line Detail
* In the Columns tab, choose the field that identifies the product, such as SKU.

4. Apply a [Mapping](/en/article/mappings-fhp4u7/) Rule
* For example:
![](https://storage.crisp.chat/users/helpdesk/website/d00f55635133d800/mappings2_5qjwkq.png)