A product's size family can be updated even after you uploaded your collection with a CSV file. 

1. To update the size family for a product that has no order linked to it : 
2. To update the size family for a product that has orders linked to it :

To update the size family for a product that has no order linked to it : 

• Navigate to the Collections tab > Products
  
  
• Click on the product you want to modify the size family
  
  
  
• Navigate to the Global settings tab 
  
  
• You can now change the size family
  
  
  
  
• Click on SAVE AND CLOSE and the size family of your product will be updated in your showroom.

To update the size family for a product that has orders linked to it : 

First of all, know that it is not possible to reduce the size family of a product already in an order (example: going from S-XXL to S-XL), but only include sizes or modify. If you are reducing the size family of a product already in an order, you will first need to remove the product from the order and add it again once the size family is updated.

• Navigate to the Collections tab > Sizing
  

• Click on Update a product sizing system

• Select or write down the name of the product that you want to change the size family
  
• After you're done updating the size family, click on Update product sizing.