# Manage Sizes

Sizes are generated by the import method used by the project.

* DXF projects get sizes from the DXF/RUL processing result.
* Excel projects get sizes from the imported Excel files or workbook sheets.

## Switch size

Use the size tabs in the editor toolbar to move between sizes. The selected size controls the pieces, sections, preview, and report labels shown in the editor.

The base size is marked with the **Base** badge.

## Set the base size for Excel projects

For Excel projects, the base size is selected during the **Excel Preview** before confirming the import.

After import, users with edit permissions can also select a size and enable **Base size** in the size toolbar.

{% hint style="info" %}
Target weight and report calculations are relative to the base size.
{% endhint %}

## DXF base size

For DXF projects, the base size comes from the processing result. The editor does not expose a base-size switch for DXF projects.

## Change the size list

To change the size list, replace or recalculate the source data:

* Use **Replace DXF** or **Recalculate pieces** for DXF projects.
* Use **Replace Excel** for Excel projects.

{% hint style="danger" %}
Replacing or recalculating source data can replace the saved size, piece, and section structure. Review the preview carefully before confirming.
{% endhint %}


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