Once you exported the Product Allergens file, the following columns are editable:
H - U are the core/main allergens.
V is to be used if the product contains no allergens (all products are set to not configured at the point of creation).
W - AH are the sub allergens.
What can be entered?
H to AH can be populated with the following to indicate the allergen information:
YES or Y
NO or N
MAYBE or M