If you want to change the template to your existing items, you need to select them in monitor page (checkbox left to the titles), click BULK OPERATIONS button:

In the window which would open, check TEMPLATE checkbox, choose the template to which you want to change and click "APPLY":

This action would reload all your item descriptions from Amazon.
Title, images and item specifics would be left as they were untouched.

*The action is not supported for multi-variation or bundle listings and neither for any type of listings from AliExpress.

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