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I spent many hours to set up depended variants but I could not. the app did not work as expected for depended variants. it is really difficult I tried everything.
Dependent custom options can easily be created with just a few clicks. Please read topic "2.6. Dependent Custom Options" in the User Guide - https://www.itoris.com/shopify-custom-options-userguide.html#2.6.%20Dependent%20Custom%20Options
I asked a few questions in your support ticket, but received no response from you yet. Please reply, I will help you configure your dependent options.