For specification items created through filter lines, you can specify whether to replace the existing specification items or to add to the existing specification items. The Replace and Add options are located at the top of the Generate grid.
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Replace: All spec items related to the filter lines are deleted, and the result lines are generated for the filter lines. By default, Replace is selected.
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Add: All spec items related to the filter lines remain, and the result lines generated are added to the existing spec items.
This functionality does not apply to specification items created manually or specification items associated to a filter line with the Manual check box selected.