Various attributes consist of multiple separated attributes. For example, the attribute size. This attribute may contain the size for coffee filters, water kettles, carpets, et cetera. Those sizes all have a different sort of format. The derived attribute Divide allows you to unlink these attributes within an attribute. You can do this based on a category selection and complement it with some filters. Navigate to Catalog > Derived attributes, create a new one, and choose the Divide option.
In this example, we'll take the size for bathroom cabinets out of the attribute for size:
Attribute name: Name the derived attribute.
Attribyute: Select the standard attribute from which you want to extract the values. In this example, it's the attribute size.
Note: it's not possible to select a derived attribute here!
Category: Select the category whose values you want to divide. For example, to extract the bathroom cabinet size, you want to select the values that appear when browsing the Bathroom cabinets category. All values that need to be shown in the Bathroom cabinets category will be selected.
Filtering: Finally, you can add a filter. For example: if you want to only select the size in centimeters. You could also use the attribute Brand and then choose brands that use size in cm.