Hello @Lindam-63 and thank you for contiuing the use of our customer community. Welcome back.
Yes, this can be rectified at any point. As long as the UPC/GTIN you are looking to use for the new item is not already in Item Management, you can use the Clone option explained here: How to Clone in Item Management to Create a New Item
Please let us know if this helped or if there is anything else we may assist with for this request and we would be delighted to. Thank you and have a wonderful day!
