1- I created new variant called " volume"
2- value (100 ml - 70 ml - 50 ml)
3- choose Variations as one product
4- assign for perfume category
5- group is main feature
when try to add variation for exist product i got the following
This product doesn't have features that allow grouping products. Please make sure that:
- You have created at least one feature with Purpose: Variations as separate products or Variations as one product.
- You have specified the value of that feature for the product.
what I'm missing here to let it works