Extra fields not sortable???

[janekbar5]

Hi
I managed to add 2 extra fields (size a and size b), according to description from other thread. My problem is that those 2 new fields can't be sortable like weight, or quantity.
Does anybody know how to make them sortable like others fields.

Example:
http://www.zancart137.may.com.pl/ind...dex&cPath=3_10

Many Thanks

[Kim]

You have an answer in your original thread.