# Model Operations

Project sizes, pieces, and sections are created by the selected import method.

In Pesipiuma v3, you normally start by importing:

* A **DXF** file, with optional **RUL** grading data.
* **Excel** source files from a supported importer.

After import, use the editor to review and refine sizes, pieces, sections, coefficients, target weight, and report labels.

{% content-ref url="/pages/8TibUsEDtgeoHlSAlfSh" %}
[Manage Sizes](/en/using-pesipiuma/preliminary-operations/manage-sizes.md)
{% endcontent-ref %}

{% content-ref url="/pages/xJA1nJWg68fv0fjAVuz1" %}
[Manage Pieces](/en/using-pesipiuma/preliminary-operations/manage-pieces.md)
{% endcontent-ref %}

## Import data using the importers

Pesipiuma includes importers for DXF/RUL and CAD-generated Excel files.

{% content-ref url="/pages/DPSu8K9UviQX2COv18FZ" %}
[Using the Importers](/en/using-pesipiuma/using-the-importers.md)
{% endcontent-ref %}


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://help.pesipiuma.app/en/using-pesipiuma/preliminary-operations.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.