Reordering of fields in registration form

I have created a new field, Postal Code, in the registration form.
There are at present 36 fields.
My new field is displayed amongst the 1-20 first fields
All other address related fields are displayed on page 2 (21-36)
Address related fields are ordered as 6-12
My I want to give my new field the order of say 8 to get it to display in the front end between Street and City
However this is not possible (to me anyway)
Is this because in the backend my new field is displayed amongst the fields 1-20 and the remainder fields are placed on page 2 (21-36)?

Help will be much appreciated

Kind regards
Torben

I solved the problem myself, but in a rather dirty way.
I created a few dummy fields (not published) which brought the Postal Code field onto the same page as the other address related fields.
On this one page Fields 21 to the end, I could reorder the fields correctly.

Torben