Showing Extended / Custom profile fields with Buddypress?

Hi,

Sorry for postic this Buddypress related topic here, but the Buddypress forum is not very active, so I was hoping that someone here could help.

I have searched for hours to try to understand how to properly use the extended / custom profile fields in Buddypress but I am still puzzled.

I need to know:
– How to I get all the custom profile fields I create in Buddypress to show on the register and members page and have this data to be properly stored in the database?

And I would also like to know:
– If it would be possible to have a drop-down list with the different profile field sections that the registering user can choose from, eg. the user could choose what type of member he/she would like to become (eg. private member, company, organisation…) and depending on what he chose from the drop-down menu, a different profile field / register page would appear.

Many thanks!