# 3.1.2 Disassemble Model

It is sometimes necessary to take apart existing models in order to:

1. Reassemble them in different configurations.
2. Retrieve the results of, for example, a cross-section optimization.

The **“DisassembleModel”**-component can be used for decomposing a structural model into its components (see Fig. 3.1.2.1 and Fig. [2.2.8.3](/2-getting-started/2-getting-started-1/setting-up-a-structural-analysis/2.2.8-retrieve-results.md#disassembling-a-structural-model)). Resulting loads, supports, and elements reference the nodes they connect to by position, regardless of whether they were initially defined using coordinates or node indexes. This allows parts of an old model to be reused and reassembled in a new model where the node indexes have changed.

At the **“CroSec”**- and **“Material”**-output only those cross sections and materials show up which were directly fed into the **“Assemble”**-component. In order to get all cross sections, it is necessary to disassemble the model elements. The cross section materials result from disassembling the cross sections.

In general the order of the output of elements, supports, materials, cross sections, loads and load case combinations determines the input-order.

The ordering of nodes corresponds to how the first occurred in the provided list of elements. For imposing an order on the nodes one needs to provide a list of positions at the "**AssembleModel**"-component's "**Pts**" input which can be found in the "Options" submenu.

<figure><img src="/files/rniprNqDsItvt3kPuljj" alt=""><figcaption><p>Fig. 3.1.2.1: A model is decomposed into its components and reassembled. This allows to change properties existing models.</p></figcaption></figure>

{% file src="/files/WZFfLUWc6Fmwpp9ZC82F" %}


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