# Feature engineering

!> This page describes the **Machine Learning Manager**, a service of the ForePaaS Legacy Platform that is not available on OVHcloud Data Platform. See [the current documentation](/en/product/index).

ForePaaS enables you to fully specify which variables to select for your model.

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## Add a value-to-predict

The value you want to predict (i.e. the label) is saved in the *Y dataset*. To add a value-to-predict, click on **Add a source** next to Y.

![machinelearning](picts/add-Y.png)

Choose the source based on the **input type** you specified when [generating your dataset](en/product/ml/pipelines/configure/dataset/input.md?id=choose-a-data-input) and save.

#### When the input type is *Tables*

You will be able to select one attribute from the training table.

![machinelearning](picts/add-Y-tables.png)


#### When the input type is *Pictures from buckets*

You will be able to select [one or several folders](/en/product/ml/pipelines/configure/dataset/input?id=pictures-from-buckets) from the training bucket.

![machinelearning](picts/add-Y-buckets.png)

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## Add features

The features, or variables, that are used to make a prediction are saved in the *X dataset*. To add features to your structured data model, click on **Add a source** next to X.

![machinelearning](picts/add-X.png)

Choose as many variables as you want from the source based on the input type you specified when [generating your dataset](en/product/ml/pipelines/configure/dataset/input.md?id=choose-a-data-input) and save.

> Shortcut tip: you have the option to *add all variables* in one go: this will add all the variables from the source **except** the one you chose as the value-to-predict.


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## Pre-processing

Advanced feature engineering should be carried out in the [Data Processing Engine (DPE)](en/product/dpe/index) on your source itself.


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##  Need help? 🆘

> You didn't find what you were looking for on this page? You can ask for help via the [OVHcloud Help Centre](https://help.ovhcloud.com/csm/fr-home?id=csm_index) or the [support guide](/en/support/index).

{Send your questions to support 🤔}(https://help.ovhcloud.com/csm/fr-home?id=csm_index)