I have been searching for a while now and read through some posts about this..

I want to allow my customers to select a shipping carrier..FedEx, DHL etc.. and use their own shipping account number.

My store offers UPS. Then if the customer wishes to use their UPS account or another carrier on their account, they can select it from a dropdown then enter the number in a text box.

Someone said they did this but they fell of the face of the earth and I haven't heard back from them.

Any help or suggestions on this would be greatly appreciated!

Thanks