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Select the System and the Scheme.
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Select all rows to which you want to assign the same classification.
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Click the right mouse button.
The following context menu appears:

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Select Select classification ....
The Select classification dialog opens.

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Select the classification you want to assign and click OK.
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Repeat the steps 2 to 5 if necessary to assign different classifications to more components.
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Confirm the Select classification dialog with OK.
You have assigned a classification to the components.