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You can find the updated Miva 10 Reference Guide here
This section assumes that you have already created an attribute template
2.1. In the Add Attribute Template dialog box, select a template from the list box that you've already created.
2.2. Click on either the Copy button or the Link button.
For example, if at some time in the future you edit the template and add another attribute called "Material", the Material attribute won't show up for this product.