# How to calculate and import LogRDev into a GenomeStudio Project
In an existing GenomeStudio genotyping project:
1. Under the **Analysis** menu, select **Reports**, then **Compute CN Metrics**:\
2. In the **Save CN Metrics Report** window, select a destination folder, enter a name for the CN Metrics file, then select **Save**.
3. A .csv file is created, which includes LogRDev calculations. Open the file in Microsoft Excel:\
4. Format the .csv file for import into GenomeStudio:
1. Delete Row 2 and all columns except for **SampleID** and **LogRDev**:\
2. Note that the **SampleID** column header has no space.
* * This is the key column that GenomeStudio will use to import the LogRDev values into the project.
* Add a space between **Sample** and **ID** to match the GenomeStudio column header in the Samples Table: **Sample ID**:\
5. Save the revised spreadsheet as a **Tab delimited text (.txt)** file.
6. In the GenomeStudio **Samples Table**, select the import icon:\
7. In the **Import** window, **Browse** to and select the tab-delimited .txt file created, then select **OK**.\
8. The **LogRDev** column will be imported into the **Samples Table**. If needed, click and drag the column from the far left of the table to the desired position.\
**Resource:** [GenomeStudio 2008.1 Framework User Guide](https://support.illumina.com/content/dam/illumina-support/documents/documentation/software_documentation/genomestudio/genomestudio-2-0/genomestudio-2008-1-framework-user-guide-11318815-a.pdf) (page 29, 'Importing a Column')
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| *For any feedback or questions regarding this article (Illumina Knowledge Article #1476), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000001476%20-%20Microarray%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |
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