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Click into a free row of the table under User-defined entries to create a new case of application for the material settings.
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In the Name column, enter a name for the case of application.
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In the Pipes column, click
to select a material.A context menu opens.

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In the context menu, click Select....
The Pipe tables dialog opens.

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Select the desired Manufacturer and the corresponding System from the drop-down lists.
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If necessary, select the desired versions of the system in the table above.
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If necessary, deactivate nominal diameters that are not required for dimensioning by clicking on the checkboxes in the corresponding rows in the Active column of the lower table.
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Close the dialog with OK.
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If necessary, repeat the steps for material selection for Hoses and Insulation Material.
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Close the Material settings dialog with OK to save the settings in the project.
The custom material combination has been created and can be assigned manually.